Piperidine derivatives

ABSTRACT

Piperidine derivatives having the formula ##STR1## wherein R&#39; represents an alkyl, an acyl, an alkoxycarbonyl, an amino or nitroso group; 
     X represents oxygen or sulfur; 
     Y represents oxygen, sulfur or a group of the formula ═N--R&#34; in which R&#34; is hydrogen or alkyl; 
     Z represents oxygen or a group of the formula &gt;N--R&#39;&#34; in which R&#39;&#34; is hydrogen or alkyl; 
     n is an integer of 1 to 4; and 
     R represents, when n is 1, alkyl, aryl, cycloalkyl, alkoxycarbonyl, substituted phosphino or substituted phosphinyl, when n is 2, alkylene, alkenylene, arylene, aralkylene; alkylenediphenylene, bis-(alkoxycarbonyl) alkylene, alkylene-bis-(oxycarbonylalkyl), dialkylene ether or diphenylene ether, when n is 3, alkanetriyl,tris-(alkoxycarbonyl)alkanetriyl, alkanetriyl-tris-(oxycarbonylalkyl) or a group of the formula ##STR2##  in which p is an integer of 1 through 8 inclusive, and, when n is 4, alkanetetrayl,tetrakis-(alkoxycarbonyl) alkanetetrayl or alkanetetrayl-tetrakis-(oxycarbonylalkyl). 
     The piperidine derivatives (I) of this invention are prepared in various manners and useful as stabilizers for synthetic polymers against thermal- and photo-deterioration thereof. A typical example of such a stabilizer is 1,3,8-triaza-3,8-dibenzyl-1,7,7,9,9-pentamethyl-spiro[4.5]decane-2,4-dione.

This is a division of application Ser. No. 792,013, filed Apr. 28, 1977, now abandoned, which, in turn, is a continuation-in-part of Ser. No. 636,659, filed on Dec. 1, 1975, now abandoned, which, in turn, was a continuation of Ser. No. 414,525, filed Nov. 9, 1973, now abandoned, which, in turn, was a continuation-in-part of application Ser. No. 258,392, filed May 31, 1972, and now abandoned.

More particularly, this invention is concerned with the piperidine derivatives having the formula ##STR3## wherein R' represents an alkyl group, a substituted alkyl group, an acyl group, an alkoxycarbonyl group, a substituted alkoxycarbonyl group, an amino group, a substituted amino group or nitroso group;

X represents oxygen atom or sulfur atom, but preferably oxygen;

Y represents oxygen atom, sulfur atom or a group of the formula ═N--R" in which R" is hydrogen atom, an alkyl group, especially methyl or a substituted alkyl group, e.g. 2-hydroxyethyl, 2-methoxyethyl or benzyl, or an unsaturated aliphatic group, e.g. allyl or 2-propynyl; most preferably Y is oxygen;

Z represents oxygen atom or a group of the formula >N-R'" in which R'" is most preferably the hydrogen atom, or R'" is an alkyl group having preferably from 1 to 4 carbon atoms, an alkenyl or alky group, e.g. 2-propynyl, at especially alkyl; or a substituted alkyl group, e.g. 2-hydroxyethyl, ethoxymethyl, 2-vinyloxyethyl, 2-phenoxyethyl, 2-acetoxyethyl, 2-benzoyloxyethyl or especially benzyl;

n is an integer of 1 through 4 inclusive, more preferably of 1 through 3, but especially of 1 to 2 and most preferred it represents 1; and

R represents, when n is 1, an alkyl group, a substituted alkyl group, an aryl group, a substituted aryl group, a cycloalkyl group, an alkoxycarbonyl group, a substituted alkoxycarbonyl group, a substituted phosphino group or a substituted phosphinyl group, when n is 2, an alkylene group, an alkenylene group, an arylene group, a substituted arylene group, an aralkylene group, an alkylenediphenylene group, a bis-(alkoxycarbonyl)-alkylene group, an alkylene-bis-(oxycarbonylalkyl) group, a dialkylene ether group or a diphenylene ether group, when n is 3, an alkanetriyl group, tris-(alkoxycarbonyl)alkanetriyl group, an alkanetriyl-tris(oxycarbonylalkyl) group or a group ##STR4## in which p is an integer of 1 through 8 inclusive, and when n is 4, an alkane tetrayl group, a tetrakis(alkoxycarbonyl)alkane-tetrayl group or an alkanetetrayl-tetrakis-(oxycarbonylalkyl) group. The p's as appeared herein may be the same or different.

This invention is also concerned with stabilization of synthetic polymers against photo- and thermal-deterioration thereof by having incorporated therein, in a sufficient amount to prevent said deterioration, at least one of the piperidine derivatives (I).

The term "synthetic polymer" as used herein are intended to embrace

polyolefins including homopolymers of olefins such as low-density and high-density polyethylene, polypropylene, polystyrene, polybutadiene, polyisoprene and the like, and copolymers of olefins with other ethylenically unsaturated monomers such as ethylene-propylene copolymer, ethylene-butene copolymer, ethylene-vinyl acetate copolymer, styrene-butadiene copolymer, acrylonitrile-styrene-butadiene copolymer and the like;

polyvinyl chlorides and polyvinylidene chlorides including homopolymer of each of vinyl chloride and vinylidene chloride, vinyl chloride-vinylidene chloride copolymer and copolymers of each of vinyl chloride and vinylidene chloride with vinyl acetate or other ethylenically unsaturated monomers;

polyacetals such as polyoxymethylene and polyoxyethylene; polyesters such as polyethylene terephthalate; polyamides such as 6-nylon, 6,6-nylon and 6,10-nylon; and polyurethanes.

In the above formula (I), R' may be exemplified by an alkyl group of 1 to 20 carbon atoms especially 1 to 8 carbon atoms and most preferred 1 carbon atom, e.g., methyl, ethyl, propyl, butyl, pentyl, hexyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl or eicosyl; a hydroxyalkyl group, e.g., 2-hydroxyethyl or 3-hydroxypropyl; allyl, 2-butenyl, 2-propynyl group; a cyanoalkyl group, e.g., 2-cyanomethyl or 2-cyanoethyl; an alkoxyalkyl group, especially one having 2 to 5 carbon atoms e.g., 2-methoxyethyl, ethoxymethyl or 2-ethoxypropyl; an alkenyloxylalkyl group, e.g., vinyloxyethyl; an aryloxyalkyl group, e.g., phenoxyethyl; an alkylthioalkyl group, e.g., methylthioethyl; an epoxyalkyl group, e.g., 2,3-epoxypropyl; an acyloxyalkyl group having preferably 3 to 14, and especially 4 to 10 carbon atoms, e.g., acetoxyethyl, octanoyloxyethyl, acryloyloxyethyl, benzoyloxyethyl, m-toluoyloxyethyl, m-methoxybenzoyloxyethyl or p-chlorobenzoyloxyethyl; an alkoxycarbonylalkyl group preferably having 3 to 15, especially 3 to 10 carbon atoms, e.g., ethoxycarbonylmethyl, octoxycarbonylmethyl or dodecyloxycarbonylmethyl; an aralkyl group, preferably having 7 to 8 carbon atoms, e.g., phenethyl, p-methylbenzyl or p-chlorobenzyl and especially benzyl; 2-hydroxy-2-phenylethyl; a 2-acyloxy-2-phenylethyl group having 10 to 20 carbon atoms, e.g., 2-acetoxy-2-phenylethyl, 2-octanoyloxy-2-phenylethyl or 2-lauroyloxy-2-phenylethyl; an acyl group, e.g., acetyl, an α,β-unsaturated aliphatic acyl group, preferably having 3 to 9, especially 3 to 4 carbon atoms, e.g., acryloyl, an acryloyl group which is substituted with alkyl or phenyl, e.g., crotonoyl or cinnamoyl; an alkoxycarbonyl group having preferably 2 to 9 carbon atoms, e.g., ethoxycarbonyl or octoxycarbonyl; an aralkyloxycarbonyl group having preferably 8 to 9 carbon atoms, e.g., benzyloxycarbonyl; an amino group; an acylamino group, having preferably 2 to 12 carbon atoms, such as acetylamino, octanoylamino, lauroylamino or aroylamino, e.g., benzoylamino, or an alkylamino group having preferably 1 to 2 carbon atoms, e.g. methylamino or ethylamino; or the nitroso group.

The group of the formula ═N--R" may be exemplified by imino, methylimino, allylimino, 2-propynylimino, 2-hydroxyethylimino, 2-methoxyethylimino or benzylimino.

The group of the formula >N--R'" may be exemplified by imino, methylimino, ethylimino, butylimino, allylimino, 2-propynylimino, 2-hydroxyethylimino, ethoxymethylimino, 2-vinyloxyethylimino, 2-phenoxyethylimino, 2-acetoxyethylimino, 2-benzyloxyethylimino or benzylimino.

The substituent R may be exemplified, when n is 1, by the unsubstituted or substituted alkyl groups as illustrated above for R' or a 2,3-epoxypropyloxycarbonylalkyl group having preferably 5 to 6 carbon atoms, e.g., 2,3-epoxypropyloxycarbonylmethyl; aryloxycarbonylalkyl groups having preferably 8 to 12 carbon atoms, e.g., phenyloxycarbonylethyl; an aryl group of 6 to 10 carbon atoms, e.g., phenyl or naphthyl; a halogen- or alkyl-substituted phenyl or naphthyl group, e.g., p-tolyl, m-chlorophenyl or o-chlorophenyl; cyclohexyl; an acyloxyalkyl group as mentioned above for R', whereby aromatic acyloxyalkyl groups having from 9 to 13 carbon atoms, saturated aliphatic acyloxyalkyl groups having from 4 to 10 carbon atoms and unsaturated aliphatic acyloxyalkyl groups having from 5 to 6 carbon atoms are prefered; a dialkoxyphosphine group having preferably 2 to 16 carbon atoms, e.g., dimethoxyphosphinyl or dioctoxyphosphinyl; the diphenoxyphosphine group of the formula ##STR5## or a group of the formula ##STR6## in which R"" is an alkyl group of from 1 to 8 carbon atoms or a phenyl group.

The substituent R, when n is 2, may be exemplified by a polymethylene group of 1 to 10, preferably 1 to 6 carbon atoms, e.g., trimethylene or hexamethylene; a group of the formula --(CH₂)_(p) --CH═CH--(CH₂)_(p) -- in which p is an integer of 1 through 8 inclusive and p's may be the same or different herein, e.g., --CH₂ --CH═CH--CH₂ --; an arylene group having preferably 6 to 7 carbon atoms, e.g., a phenylene group which may be substituted with alkyl, e.g., ##STR7## a xylylene of the formula ##STR8## an alkylenediphenylene group having from 13 to 15 carbon atoms, e.g., a group of the formula ##STR9## a bis-(alkoxycarbonyl)alkylene group of the formula ##STR10## in which p is as defined above and p₁ is an integer of zero through 8 inclusive, said bis-(alkoxycarbonyl)alkylene group preferably contains from 8 to 14 carbon atoms, e.g., --(CH₂)₂ OCO(CH₂)₄ COO(CH₂)₂ --; a group of the formula ##STR11## in which p is as defined above, e.g., ##STR12## an alkylene-bis-(oxycarbonylalkyl) group of the formula ##STR13## in which p is as defined above, said group having preferably 6 to 12 carbon atoms, e.g., --CH₂ COO(CH₂)₂ OCOCH₂ --; a dialkylene ether group of the formula --(CH₂)_(p) --O--(CH₂)_(p) -- in which p is as defined above, e.g., --CH₂ --O--CH₂ -- or preferably --CH₂ CH₂ --O--CH₂ CH₂ --; or a diphenylene ether group of the formula ##STR14##

The substituent R, when n is 3, may be exemplified by a group of the formula ##STR15## in which p is as defined above, e.g., ##STR16## a tris-(alkoxycarbonyl)alkanetriyl group of the formula ##STR17## in which p is as defined above, said group having preferably from 12 to 15 carbon atoms, e.g., ##STR18## a group of the formula ##STR19## in which p is as defined above, e.g., ##STR20## an alkanetriyl-tris(oxycarbonylalkyl) group of the formula ##STR21## in which p is as defined above, said group having preferably from 9 to 13 carbon atoms, e.g., ##STR22## or a group of the formula ##STR23## in which p is as defined above, e.g., ##STR24##

The substituent R, when n is 4, may be exemplified by a group of the formula ##STR25## in which p is as defined above; a group of the formula ##STR26## in which p is defined above, e.g., ##STR27## particularly ##STR28## or an alkanetetrayl-tetrakis(oxycarbonylalkyl) group, e.g. of the formula ##STR29## in which p is as defined above, said group having preferably from 13 to 17 carbon atoms.

Synthetic polymers have been widely utilized in the art, in view of their excellent properties, in various forms or shapes, for example, filament, fibre, yarn, film, sheet, other molded article, latex and foam. However, these polymers have some drawbacks such as poor light- and heat-stabilities and the like. Stated illustratively, polyolefins and polyurethane elastomers frequently tend to undergo severe deterioration when exposed to light such as sunlight or ultraviolet rays, and polyvinyl chloride and polyvinylidene chloride frequently tend to deteriorate and become colored by the action of light and heat together with elimination of hydrogen chloride therefrom. Polyamides are also frequently subjected to photo-deterioration. For the purpose of stabilizing these synthetic polymers against such deterioration, there have heretofore been proposed in the art a number of stabilizers; for example, for polyolefins, benzotriazole compounds and benzophenone compounds; for polyurethanes, phenol compounds and benzophenone compounds; and for polyvinyl chloride and polyvinylidine chloride, lead salts such as basic lead silicate and tribasic lead maleate, and organotin compounds such as dibutyltin laurate and dibutyltin maleate.

Although such prior stabilizers are known to be considerably satisfactory, there still remained some problems to be improved.

Thus, numerous attempts have been made in the art to find and develop new and more effective stabilizers.

As a result of our extensive studies, it has now been found that the new piperidine derivatives (I) of this invention can be satisfactorily prepared and exhibit a high stabilizing effect against photo- and thermal-deterioration of the synthetic polymers.

It is, accordingly, an object of this invention to provide new and useful piperidine derivatives (I).

Another object is to provide synthetic polymer composition stabilized against the deterioration thereof by having incorporated therein a sufficient amount to prevent the deterioration of at least one of the piperidine derivatives (I).

Other objects of this invention will become apparent to those skilled in the art from the following description.

In one aspect of this invention, the piperidine derivatives (I) are all new substances unknown in the art.

Among the piperidine derivatives (I) of this invention, particularly useful are the piperidine derivatives having the formula (I) wherein

R' represents an alkyl group of 1 to 20 carbon atoms, a hydroxyalkyl group, allyl group, 2-propynyl group, a cyanoalkyl group, an alkoxyalkyl group, an alkenyloxyalkyl group, an aryloxyalkyl group, an alkylthioalkyl group, an epoxyalkyl group, an acyloxyalkyl group, an alkoxycarbonylalkyl group, an aralkyl group, acryloyl group, an acryloyl group which is substituted with alkyl or phenyl, an aralkyloxycarbonyl group, amino group or an amino group which is substituted with aroyl or alkyl;

R represents, when n is 1, the above-defined unsubstituted or substituted alkyl group, a phenyl or naphthyl group which may be substituted with halogen or alkyl in the aryl moiety, a cycloalkyl group, an alkoxycarbonyl group, an aralkoxycarbonyl group, the group of the formula ##STR30## or the group of the formula ##STR31## when n is 2, a polymethylene group of 1 to 10 carbon atoms, a group of the formula --(CH₂)_(p) --CH═CH--(CH₂)_(p) -- in which p is an integer of 1 through 8 inclusive and p's may be the same or different, a phenylene group which may be substituted with alkyl, a group of the formula, ##STR32## a group of the formula ##STR33## a group of the formula ##STR34## in which p and p₁ are as defined above, a group of the formula ##STR35## in which p is as defined above, a group of the formula ##STR36## in which p is as defined above, a group of the formula --(CH₂)_(p) --O--(CH₂)_(p) -- in which p is as defined above or a group of the formula ##STR37## when n is 3, a group of the formula ##STR38## in which p is as defined above, a group of the formula ##STR39## in which p is as defined above, a group of the formula ##STR40## in which p is as defined above, a group of the formula ##STR41## in which p is as defined above or a group of the formula ##STR42## in which p is as defined above, and, when n is 4, a group of the formula ##STR43## in which p is as defined above, a group of the formula ##STR44## in which p is as defined above or a group of the formula ##STR45## in which p is as defined above. Y represents oxygen atom, sulfur atom or a group of the formula ═N--R" in which R" is hydrogen atom or the above-defined unsubstituted or substituted alkyl group; and

Z represents oxygen atom or a group of the formula >N--R'" in which R'" is hydrogen atom or the above-defined unsubstituted or substituted alkyl group.

More preferable group of the piperidine derivatives (I) of this invention can be represented by the following formula (II): ##STR46##

In the above formula (II),

R₁ represents an alkyl group having from 1 to 8 carbon atoms, especially the methyl group, the allyl group, an aralkyl group having from 7 to 8 carbon atoms, especially the benzyl group, an acyloxyalkyl group having from 4 to 10 carbon atoms or a hydroxyalkyl group having from 2 to 3 carbon atoms, especially the hydroxyethyl group, the 2,3-epoxypropyl group, an α,β-unsaturated aliphatic acyl group having from 3 to 4 carbon atoms or an acetyl group,

R₃ represents an alkyl group of from 1 to 4 carbon atoms or most preferably the hydrogen atom; m is an integer of 1 or 2, most preferably 1; and

R₂ represents when m is 1, an alkyl group having from 1 to 18, especially 1 to 12 carbon atoms, a hydroxyalkyl group having from 2 to 3 carbon atoms, especially 2-hydroxyethyl, an alkenyl group having from 3 to 4 carbon atoms, especially allyl, a 2-hydroxy-2-phenylethyl group, a 2,3-epoxypropyl group, an aralkyl group having from 7 to 8 carbon atoms, especially benzyl, an acyloxyalkyl group having preferably from 9 to 13 carbon atoms as aromatic acyloxyalkyl, from 4 to 10 carbon atoms as saturated aliphatic acyloxyalkyl and from 5 to 6 carbon atoms as unsaturated aliphatic acyloxyalkyl, an alkoxycarbonylmethyl group having from 3 to 10 carbon atoms, phenyl or cyclohexyl, and when m is 2, an alkylene group having from 1 to 6 carbon atoms, a butenylene group, a 2,4-toluylene group, a xylylene group of the formula ##STR47## or a group of the formula --(CH₂)_(p) --O--(CH₂)_(p) -- in which p is as defined above, especially the diethylene ether group.

Representatives of the new piperidine derivatives (I) of this invention are illustratively listed below. However, it should be understood that these illustrated compounds are not contemplated to be limiting the scope of this invention.

1. 1,3,8-triaza-3,7,7,8,9,9-hexamethyl-spiro[4.5]decane-2,4-dione

2. 1,3,8-triaza-3-butyl-7,7,8,9,9-pentamethyl-spiro[4.5]decane-2,4-dione

3. 1,3,8-triaza-7,7,8,9,9-pentamethyl-3-octyl-spiro[4.5]decane-2,4-dione

4. 1,3,8-triaza-3,8-diethyl-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

5. 1,3,8-triaza-3-butyl-8-ethyl-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

6. 1,3,8-triaza-8-ethyl-7,7,9,9-tetramethyl-3-octyl-spiro[4.5]decane-2,4-dione

7. 1,3,8-triaza-1,3,7,7,8,9,9-heptamethyl-spiro[4.5]decane-2,4-dione

8. 1,3,8-triaza-3-butyl-1,8-diethyl-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

9. 1,3,8-triaza-1-butyl-8-ethyl-7,7,9,9-tetramethyl-3-octyl-spiro[4.5]decane-2,4-dione

10. 3,8-diaza-7,7,8,9,9-pentamethyl-3-octadecyl-1-oxa-spiro[4.5]decane-2,4-dione

11. 8-allyl-1,3,8-triaza-7,7,9,9-tetramethyl-3-octyl-spiro[4.5]decane-2,4-dione

12. 1,3,8-triaza-8-benzyl-7,7,9,9-tetramethyl-3-octyl-spiro[4.5]decane-2,4-dione

13. 1,3,8-triaza-8-benzyl-7,7,9,9-tetramethyl-3-octadecyl-spiro[4.5]decane-2,4-dione

14. 1,3,8-triaza-3,7,7,8,9,9-hexamethyl-1-ethoxymethyl-spiro[4.5]decane-2,4-dione

15. 1,3,8-triaza-3,7,7,8,9,9-hexamethyl-1-(2-phenoxyethyl)-spiro[4.5]decane-2,4-dione

16. 1,3,8-triaza-3,7,7,8,9,9-hexamethyl-1-(2-vinyloxyethyl)-spiro[4.5]decane-2,4-dione

17. 1,3,8-triaza-3-butyl-8-(2-hydroxyethyl)-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

18. 1,3,8-triaza-8-(2-hydroxyethyl)-7,7,9,9-tetramethyl-3-octyl-spiro[4.5]decane-2,4-dione

19. 1,3,8-triaza-8-(2-cyanoethyl)-1,3,7,7,9,9-hexamethyl-spiro[4.5]decane-2,4-dione

20. 1,3,8-triaza-3-butyl-8-(2,3-epoxypropyl)-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

21. 1,3,8-triaza-8-(2-ethoxyethyl)-3,7,7,9,9-pentamethyl-spiro[4.5]decane-2,4-dione

22. 1,3,8-triaza-8-crotonoyl-3,7,7,9,9-pentamethyl-spiro[4.5]decane-2,4-dione

23. 1,3,8-triaza-8-cinnamoyl-3,7,7,9,9-pentamethyl-spiro[4.5]decane-2,4-dione

24. 1,3,8-triaza-8-benzyloxycarbonyl-3-butyl-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

25. 1,3,8-triaza-3,7,7,9,9-pentamethyl-8-nitroso-spiro[4.5]decane-2,4-dione

26. 1,3,8-triaza-3-butyl-7,7,9,9-tetramethyl-8-nitroso-spiro[4.5]decane-2,4-dione

27. 8-amino-1,3,8-triaza-3-butyl-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

28. 1,3,8-triaza-8-benzamido-3-butyl-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

29. 1,3,8-triaza-3-butyl-8-ethylamino-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

30. 3-allyl-1,3,8-triaza-7,7,8,9,9-pentamethyl-spiro[4.5]decane-2,4-dione

31. 3-allyl-1,3,8-triaza-8-ethyl-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

32. 1,3-diallyl-1,3,8-triaza-7,7,8,9,9-pentamethyl-spiro[4.5]decane-2,4-dithione

33. 3,8-diallyl-1,3,8-triaza-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

34. 3,8-diallyl-1,3,8-triaza-1-benzyl-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

35. 3-allyl-1,3,8-triaza-8-(2,3-epoxypropyl)-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

36. 3-allyl-1,3,8-triaza-8-benzyl-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

37. 1,3,8-triaza-7,7,9,9-tetramethyl-3,8-di(2-propynyl)-spiro[4.5]decane-2,4-dione

38. 1,3,8-triaza-8-(2,3-epoxypropyl)-7,7,9,9-tetramethyl-3-(2-propynyl)-spiro[4.5]decane-2,4-dione

39. 1,3,8-triaza-3,8-bis(2-hydroxyethyl)-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

40. 1,3,8-triaza-8-cyanomethyl-3-(3-hydroxypropyl)-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

41. 1,3,8-triaza-7,7,9,9-tetramethyl-3,8-bis(2-methoxyethyl)-spiro[4.5]decane-2,4-dione

42. 1,3,8-triaza-1,7,7,9,9-pentamethyl-3,8-bis(2-methoxyethyl)-spiro[4.5]decane-2,4-dione

43. 1,3,8-triaza-3-ethoxymethyl-7,7,8,9,9-pentamethyl-spiro[4.5]decane-2,4-dione

44. 1,3,8-triaza-8-ethyl-7,7,9,9-tetramethyl-3-(2-vinyloxyethyl)-spiro[4.5]decane-2,4-dione

45. 8-allyl-1,3,8-triaza-7,7,9,9-tetramethyl-3-(2-phenoxyethyl)-spiro[4.5]decane-2,4-dione

46. 3-(2-acetoxyethyl)-1,3,8-triaza-8-benzyl-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

47. 3,8-bis(2-acetoxyethyl)-1,3,8-triaza-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

48. 1,3,8-triaza-2,2,6,6-tetramethyl-3,8-bis(2-octanoyloxyethyl)-spiro[4.5]decane-2,4-dione

49. 8-acryloyl-3-(2-acryloyloxyethyl)-1,3,8-triaza-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

50. 3,8-bis(2-acryloyloxyethyl)-1,3,8-triaza-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

51. 1,3,8-triaza-3-(2-benzoyloxyethyl)-8-ethyl-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

52. 1,3,8-triaza-3,8-bis(2-benzoyloxyethyl)-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

53. 1,3,8-triaza-7,7,9,9-tetramethyl-3,8-bis(2-m-toluoyloxyethyl)-spiro[4.5]decane-2,4-dione

54. 3,8-bis(2-o-anisoyloxyethyl)-1,3,8-triaza-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

55. 1,3,8-triaza-3,8-bis(2-p-chlorobenzoyloxyethyl)-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

56. 1,3,8-triaza-3,8-bis(2-cyanoethyl)-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

57. 1,3,8-triaza-7,7,8,9,9-pentamethyl-3-(2-methylthioethyl)-spiro[4.5]decane-2,4-dione

58. 1,3,8-triaza-3-(2,3-epoxypropyl)-7,7,8,9,9-pentamethylspiro[4.5]decane-2,4-dione

59. 1,3,8-triaza-3,8-bis(2,3-epoxypropyl)-7,7,9,9-tetramethylspiro[4.5]decane-2,4-dione

60. 1,3,8-triaza-3-ethoxycarbonylmethyl-7,7,8,9,9-pentamethylspiro[4.5]decane-2,4-dione

61. 1,3,8-triaza-3-(2,3-epoxypropyloxycarbonylmethyl)-7,7,8,9,9-pentamethyl-spiro[4.5]decane-2,4-dione

62. 1,3,8-triaza-7,7,8,9,9-pentamethyl-3-phenoxycarbonylmethyl-spiro[4.5]decane-2,4-dione

63. 1,3,8-triaza-3-ethoxycarbonyl-7,7,8,9,9-pentamethylspiro[4.5]decane-2,4-dione

64. 1,3,8-triaza-3-benzyl-7,7,8,9,9-pentamethyl-spiro[4.5]decane-2,4-dione

65. 1,3,8-triaza-3-benzyl-7,7,9,9-tetramethyl-8-octyl-spiro[4.5]decane-2,4-dione

66. 1,3,8-triaza-3-benzyl-1,8-diethyl-7,7,9,9-tetramethylspiro[4.5]decane-2,4-dione

67. 1,3,8-triaza-1,3-dibenzyl-7,7,8,9,9-pentamethyl-spiro[4.5]decane-2,4-dithione

68. 1,3,8-triaza-7,7,9,9-tetramethyl-3-phenethyl-8-(2-propynyl)spiro[4.5]decane-2,4-dione

69. 1,3,8-triaza-3,8-dibenzyl-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

70. 1,3,8-triaza-3,8-dibenzyl-7,7,9,9-pentamethyl-spiro[4.5]decane-2,4-dione

71. 1,3,8-triaza-3,8-dibenzyl-1-butyl-7,7,9,9-tetramethylspiro[4.5]decane-2,4-dione

72. 1,3,8-triaza-3,8-dibenzyl-1-(2-hydroxyethyl)-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

73. 1-(2-acetoxyethyl)-1,3,8-triaza-3,8-dibenzyl-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

74. 1,3,8-triaza-1-(2-benzoyloxyethyl)-3,8-dibenzyl-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

75. 1,3,8-triaza-3,8-dibenzyl-7,7,9,9-tetramethyl-1-(2-propynyl)-spiro[4.5]decane-2,4-dione

76. 1,3,8-triaza-1,3,8-tribenzyl-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

77. 1,3,8-triaza-3-benzyl-8-(2,3-epoxypropyl)-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

78. 1,3,8-triaza-7,7,8,9,9-pentamethyl-3-(p-methylbenzyl)spiro[4.5]decane-2,4-dione

79. 1,3,8-triaza-3-(p-chlorobenzyl)-7,7,8,9,9-pentamethylspiro[4.5]decane-2,4-dione

80. 8-acryloyl-1,3,8-triaza-3-benzyl-7,7,9,9-tetramethylspiro[4.5]decane-2,4-dione

81. 1,3,8-triaza-3-cyclohexyl-7,7,8,9,9-pentamethyl-spiro[4.5]decane-2,4-dione

82. 1,3,8-triaza-3-cyclohexyl-8-(2,3-epoxypropyl)-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

83. 1,3,8-triaza-8-benzyl-3-cyclohexyl-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

84. 1,3,8-triaza-8-benzyl-4-benzylimino-3-cyclohexyl-7,7,9,9-tetramethyl-spiro[4.5]decane-2-one

85. 1,3,8-triaza-7,7,8,9,9-pentamethyl-3-phenyl-spiro[4.5]decane-2,4-dione

86. 1,3,8-triaza-8-(2,3-epoxypropyl)-7,7,9,9-tetramethyl-3-phenyl-spiro[4.5]decane-2,4-dione

87. 1,3,8-triaza-4-imino-7,7,8,9,9-pentamethyl-3-phenylspiro[4.5]decane-2-one

88. 1,3,8-triaza-7,7,8,9,9-pentamethyl-4-methylimino-3-phenyl-spiro[4.5]decane-2-one

89. 1,3,8-triaza-4-imino-7,7,8,9,9-pentamethyl-3-phenylspiro[4.5]decane-2-thione

90. 8-allyl-4-allylimino-1,3,8-triaza-7,7,9,9-tetramethyl-3-phenyl-spiro[4.5]decane-2-one

91. 1,3,8-triaza-8-(2-hydroxyethyl)-4-(2-hydroxyethylimino)-7,7,9,9-tetramethyl-3-phenyl-spiro[4.5]decane-2-one

92. 1,3,8-triaza-1,7,7,9,9-pentamethyl-8-(2-methoxyethyl)-4-(2-methoxyethylimino)-3-phenyl-spiro[4.5]decane-2-one

93. 1,3,8-triaza-1,8-dibenzyl-7,7,9,9-tetramethyl-3-phenylspiro[4.5]decane-4-one-2-thione

94. 3,8-diaza-4-imino-7,7,8,9,9-pentamethyl-3-(α-naphthyl)-1-oxa-spiro[4.5]decane-2-thione

95. 1,3,8-triaza-8-benzyl-7,7,9,9-tetramethyl-3-(p-tolyl)spiro[4.5]decane-2,4-dione

96. 3,8-diaza-7,7,8,9,9-pentamethyl-1-oxa-3-(p-tolyl)spiro[4.5]decane-2,4-dione

97. 3,8-diaza-4-imino-7,7,8,9,9-pentamethyl-1-oxa-3-(p-tolyl)spiro[4.5]decane-2-one

98. 3,8-diaza-3-(o-chlorophenyl)-7,7,8,9,9-pentamethyl-1-oxa-spiro[4.5]decane-2,4-dione

99. 3,8-diaza-3-(o-chlorophenyl)-7,7,8,9,9-pentamethyl-4-methylimino-1-oxa-spiro[4.5]decane-2-one

100. 1,3,8-triaza-7,7,8,9,9-pentamethyl-3-diphenoxyphosphinospiro[4.5]decane-2,4-dithione

101. 1,3,8-triaza-7,7,8,9,9-pentamethyl-3-diphenoxyphosphinylspiro[4.5]decane-2,4-dithione

102. 1,3-bis(1,3,8-triaza-1,7,7,8,9,9-hexamethyl-2,4-dioxospiro[4.5]-3-decyl)propane

103. 1,6-bis(1,3,8-triaza-7,7,8,9,9-pentamethyl-2,4-dioxospiro[4.5]-3-decyl)hexane

104. 1,6-bis(1,3,8-triaza-1,7,7,8,9,9-hexamethyl-2,4-dioxospiro[4.5]-3-decyl)hexane

105. 1,6-bis[1,3,8-triaza-7,7,9,9-tetramethyl-2,4-dioxo-8-(2-propynyl)-spiro[4.5]-3-decyl]hexane

106. 1,6-bis[1,3,8-triaza-8-(2,3-epoxypropyl)-7,7,9,9-tetramethyl-2,4-dioxo-spiro[4.5]-3-decyl]hexane

107. 1,6-bis(1,3,8-triaza-8-benzyl-7,7,9,9-tetramethyl-2,4-dioxo-spiro[4.5]-3-decyl)hexane

108. 1,4-bis(1,3,8-triaza-1,7,7,8,9,9-hexamethyl-2,4-dioxospiro[4.5]-3-decyl)trans-2-butene

109. 2,2'-bis(1,3,8-triaza-7,7,8,9,9-pentamethyl-2,4-dioxospiro[4.5]-3-decyl)diethylether

110. 2,2'-bis(1,3,8-triaza-1,7,7,8,9,9-hexamethyl-2,4-dioxospiro[4.5]-3-decyl)diethylether

111. α,α'-bis(1,3,8-triaza-7,7,8,9,9-pentamethyl-2,4-dioxospiro[4.5]-3-decyl)-p-xylene

112. α,α'-bis(1,3,8-triaza-1,7,7,8,9,9-hexamethyl-2,4-dioxospiro[4.5]-3-decyl)-p-xylene

113. α,α'-bis[1,3,8-triaza-8-(2,3-epoxypropyl)-7,7,9,9-tetramethyl-2,4-dioxo-spiro[4.5]-3-decyl]-p-xylene

114. α,α'-bis(1,3,8-triaza-8-benzyl-7,7,9,9-tetramethyl-2,4-dioxo-spiro[4.5]-3-decyl)-p-xylene

115. 2,4-bis(1,3,8-triaza-7,7,8,9,9-pentamethyl-2,4-dioxospiro[4.5]-3-decyl)toluene

116. 2,4-bis(3,8-diaza-4-imino-7,7,8,9,9-pentamethyl-1-oxa-2-oxo-spiro[4.5]-3-decyl)toluene

117. 4,4'-bis(1,3,8-triaza-7,7,8,9,9-pentamethyl-2,4-dioxospiro[4.5]-3-decyl)diphenylmethane

118. 4,4'-bis[1,3,8-triaza-8-(2,3-epoxypropyl)-7,7,9,9-tetramethyl-2,4-dioxo-spiro[4.5]-3-decyl]diphenylmethane

119. 4,4'-bis[1,3,8-triaza-7,7,9,9-tetramethyl-2-oxo-8-(2-propynyl)-4-(2-propynylimino)-spiro[4.5]-3-decyl]diphenylmethane

120. 4,4'-bis(1,3,8-triaza-7,7,8,9,9-pentamethyl-2,4-dioxospiro[4.5]-3-decyl)diphenylether

121. bis[2-(1,3,8-triaza-7,7,8,9,9-pentamethyl-2,4-dioxospiro[4.5]-3-decyl)ethyl]adipate

122. bis[2-(1,3,8-triaza-7,7,8,9,9-pentamethyl-2,4-dioxospiro[4.5]-3-decyl)ethyl]terephthalate

123. ethyleneglycol bis(1,3,8-triaza-7,7,8,9,9-pentamethyl-2,4-dioxo-spiro[4.5]-3-decylmethylcarboxylate)

124. 4-(1,3,8-triaza-7,7,8,9,9-pentamethyl-2,4-dioxo-spiro[4.5]-3-decylmethyl)-1,7-bis(1,3,8-triaza-7,7,8,9,9-pentamethyl-2,4-dioxo-spiro[4.5]-3-decyl)heptane

125. tris[2-(1,3,8-triaza-7,7,8,9,9-pentamethyl-2,4-dioxospiro[4.5]-3-decyl)ethyl]tricarballylate

126. tris[2-(1,3,8-triaza-7,7,8,9,9-pentamethyl-2,4-dioxospiro[4.5]-3-decyl)ethyl]trimellitate

127. tris(1,3,8-triaza-7,7,8,9,9-pentamethyl-2,4-dioxospiro[4.5]-3-decyl)acetin

128. 2,2',2"-tris[1,3,8-triaza-8-(2,3-epoxypropyl)-7,7,9,9-tetramethyl-2,4-dioxo-spiro[4.5]-3-decyl]triethylisocyanurate

129. tetrakis[2-(1,3,8-triaza-7,7,8,9,9-pentamethyl-2,4-dioxo-spiro[4.5]-3-decyl)ethyl]pyromellitate

130. pentaerythritol tetrakis(1,3,8-triaza-7,7,8,9,9-pentamethyl-2,4-dioxo-spiro[4.5]-3-decylmethylcarboxylate)

131. 3,8-bis(2-methylallyl)-1,3,8-triaza-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

132. 3,8-bis(2-ethoxypropyl)-1,3,8-triaza-7,7,9,9-tetramethylspiro[4.5]decane-2,4-dione

133. 3,8-bis(2-lauroyloxyethyl)-1,3,8-triaza-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

134. 3,8-bis(octoxycarbonylmethyl)-1,3,8-triaza-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

135. 3,8-bis(dodecyloxycarbonylmethyl)-1,3,8-triaza-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

136. 3,8-bis(2-hydroxy-2-phenylethyl)-1,3,8-triaza-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

137. 3,8-bis(2-acetoxy-2-phenylethyl)-1,3,8-triaza-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

138. 3,8-bis(2-benzoyloxy-2-phenylethyl)-1,3,8-triaza-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

139. 3,8-bis(2-octanoyloxy-2-phenylethyl)-1,3,8-triaza-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

140. 3,8-bis(2-lauroyloxy-2-phenylethyl)-1,3,8-triaza-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

141. 3,8-bis(methoxycarbonyl)-1,3,8-triaza-7,7,9,9-tetramethylspiro[4.5]decane-2,4-dione

142. 3,8-bis(butoxycarbonyl)-1,3,8-triaza-7,7,9,9-tetramethylspiro[4.5]decane-2,4-dione

143. 3,8-bis(octoxycarbonyl)-1,3,8-triaza-7,7,9,9-tetramethylspiro[4.5]decane-2,4-dione

144. 3,8-bis(2-phenylethoxycarbonyl)-1,3,8-triaza-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

145. 3-cyanomethyl-1,3,8-triaza-7,7,8,9,9-pentamethyl-spiro[4.5]decane-2,4-dione

146. 3-(4-tert.-butylphenoxycarbonylmethyl)-1,3,8-triaza-7,7,8,9,9-pentamethyl-spiro[4.5]decane-2,4-dione

147. 3-dodecyloxycarbonyl-1,3,8-triaza-7,7,8,9,9-pentamethylspiro[4.5]decane-2,4-dione

148. 3-benzyloxycarbonyl-1,3,8-triaza-7,7,8,9,9-pentamethylspiro[4.5]decane-2,4-dione

149. 3-dimethoxyphosphinyl-1,3,8-triaza-7,7,8,9,9-pentamethylspiro[4.5]decane-2,4-dione

150. 3-dipropoxyphosphinyl-1,3,8-triaza-7,7,8,9,9-pentamethylspiro[4.5]decane-2,4-dione

151. 3-dioctoxyphosphinyl-1,3,8-triaza-7,7,8,9,9-pentamethylspiro[4.5]decane-2,4-dione

152. 8-dodecyl-3-octyl-1,3,8-triaza-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

153. 8-octadecyl-3-octyl-1,3,8-triaza-7,7,9,9-tetramethylspiro[4.5]decane-2,4-dione

154. 8-(2-hydroxypropyl)-3-octyl-1,3,8-triaza-7,7,9,9-tetramethylspiro[4.5]decane-2,4-dione

155. 8-ethoxycarbonylmethyl-3-octyl-1,3,8-triaza-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

156. 8-(2-phenylethyl)-3-octyl-1,3,8-triaza-7,7,9,9-tetramethylspiro[4.5]decane-2,4-dione

157. 8-acetylamino-3-octyl-1,3,8-triaza-7,7,9,9-tetramethylspiro[4.5]decane-2,4-dione

158. 8-octanoylamino-3-octyl-1,3,8-triaza-7,7,9,9-tetramethylspiro[4.5]decane-2,4-dione

159. 8-lauroylamino-3-octyl-1,3,8-triaza-7,7,9,9-tetramethylspiro[4.5]decane-2,4-dione

160. 8-methylamino-3-octyl-1,3,8-triaza-7,7,9,9-tetramethylspiro[4.5]decane-2,4-dione

161. 1,1-bis(1,3,8-triaza-7,7,8,9,9-pentamethyl-2,4-dioxospiro[4.5]decyl-3-)methane

162. 1,4-bis(1,3,8-triaza-7,7,8,9,9-pentamethyl-2,4-dioxospiro[4.5]decyl-3-)benzene

163. 4,4'-bis(1,3,8-triaza-7,7,8,9,9-pentamethyl-2,4-dioxospiro[4.5]decyl-3-)2,2-diphenylpropan

164. bis[2-(1,3,8-triaza-7,7,8,9,9-pentamethyl-2,4-dioxospiro[4.5]decyl-3-)ethyl]succinate

165. bis[2-(1,3,8-triaza-7,7,8,9,9-pentamethyl-2,4-dioxospiro[4.5]decyl-3-)ethyl]-sebacate

166. 1,6-hexanediol bis[(1,3,8-triaza-7,7,8,9,9-pentamethyl-2,4-dioxo-spiro[4.5]decyl-3-)methylcarboxylate]

167. 1,6-hexanediol bis[(1,3,8-triaza-7,7,8,9,9-pentamethyl-2,4-dioxo-spiro[4.5]decyl-3-)2-ethylcarboxylate]

168. 1,1,1-trimethylolpropane tris[(1,3,8-triaza-7,7,8,9,9-pentamethyl-2,4-dioxo-spiro[4.5]decyl-3-)methylcarboxylate]

169. pentaerythritol tetrakis[(1,3,8-triaza-7,7,8,9,9-pentamethyl-2,4-dioxo-spiro[4.5]decyl-3-)2-ethylcarboxylate]

170. 1,3,8-triaza-3-octyl-8-acetyl-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

171. 1,3,8-triaza-3-octyl-8-acryloyl-7,7,9,9-tetramethylspiro[4.5]decane-2,4-dione

172. 1,3,8-triaza-3-butyl-8-octyl-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

173. 1,3,8-triaza-3-butyl-8-acetoxyethyl-7,7,9,9-tetramethylspiro[4,5]decane-2,4-dione

174. 1,3,8-triaza-3-butyl-8-ethoxycarbonylmethyl-7,7,9,9-tetramethyl-spiro[4,5]-decane-2,4-dione

175. 1,3,8-triaza-3-cyclohexyl-8-propyl-7,7,9,9-tetramethylspiro[4,5]decane-2,4-dione

176. 3-butyl-8-m hoxyethyl-7,7,9,9-tetramethyl-1,3,8-triazaspiro[4,5]-decane-2,4-dione

177. 3-stearyl-8-allyl-7,7,9,9-tetramethyl-1,3,8-triazaspiro[4,5]decane-2,4-dione

In view of stabilizing effects, the following piperidine derivatives (I) are, in particular, preferable and effective:

1,3,8-triaza-3-butyl-7,7,8,9,9-pentamethyl-spiro[4.5]decane-2,4-dione,

1,3,8-triaza-7,7,8,9,9-pentamethyl-3-octyl-spiro[4.5]decane-2,4-dione,

8-allyl-1,3,8-triaza-7,7,9,9-tetramethyl-3-octyl-spiro[4.5]decane-2,4-dione

1,3,8-triaza-8-benzyl-7,7,9,9-tetramethyl-3-octyl-spiro[4.5]decane-2,4-dione,

1,3,8-triaza-8-(2-hydroxyethyl)-7,7,9,9-tetramethyl-3-octylspiro[4.5]-decane-2,4-dione,

1,3,8-triaza-3-butyl-8-(2,3-epoxypropyl)-7,7,9,9-tetramethylspiro[4.5]-decane-2,4-dione,

3-allyl, 1,3,8-triaza-7,7,8,9,9-pentamethyl-spiro[4.5]decane-2,4-dione,

3,8-diallyl-1,3,8-triaza-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione,

3-allyl-1,3,8-triaza-(2,3-epoxypropyl)-7,7,9,9-tetramethylspiro[4.5]decane-2,4-dione,

3,8-bis(2-acetoxyethyl)-1,3,8-triaza-7,7,9,9-tetramethylspiro[4.5]decane-2,4-dione,

1,3,8-triaza-3-(2,3-epoxypropyl)-7,7,8,9,9-pentamethylspiro[4.5]decane-2,4dione

1,3,8-triaza-3,8-di(2,3-epoxypropyl)-7,7,9,9-tetramethylspiro[4.5]decane-2,4dione,

1,3,8-triaza-3,8-dibenzyl-1,7,7,9,9-pentamethyl-spiro[4.5]decane-2,4dione,

1,3-bis(1,3,8-triaza-1,7,7,8,9,9-hexamethyl-2,4-dioxo-spiro[4.5]-3-decyl)propane,

1,6-bis(1,3,8-triaza-1,7,7,8,9,9-hexamethyl-2,4-dioxospiro[4.5]-3-decyl)hexane,

2,2'-bis(1,3,8-triaza-7,7,8,9,9-pentamethyl-2,4-dioxospiro[4.5]-3-decyl)diethylether,

2,2'-bis(1,3,8-triaza-1,7,7,8,9,9-hexamethyl-2,4-dioxospiro[4.5]-3-decyl)diethylether,

1,3,8-triaza-1,3,7,7,8,9,9-heptamethy-spiro[4.5]decane-2,4-dione and

α,α'-bis(1,3,8-triaza-1,7,7,8,9,9-hexamethyl-2,4-dioxo spiro[4.5]-3-decyl)-p-xylene.

The most preferred compounds are compounds No. 2,3,12, 30,58 and 103 (cf. list on pages 14 to 21).

The piperidine derivatives (I) of this invention may be readily prepared in various manners. For instance, they are prepared by any of the thirteen routes as illustratively shown below.

(1) The compound (III) or the alkalimetal salt thereof is reacted with the halide (R₀ --X₁) in a molar ratio of 1:2 by heating in the presence or absence of a base to produce the compound (IV). ##STR48## In the above formulae, R₀ represents an alkyl group, allyl group, 2-propynyl group, an epoxyalkyl group, an aralkyl group, an alkoxyalkyl group, an acyloxyalkyl group, an alkoxycarbonylalkyl group, 2-hydroxy-2-phenylethyl group, an 2-acyloxy-2-phenylethyl group, an alkoxycarbonyl group or an aralkoxycarbonyl group and X₁ represents a halogen atom.

This method will be more fully exemplified by Examples 1 and 2 and provide, for example, those compounds designated by Nos. 1, 4, 33, 37, 59, 69 and 131-144 hereinabove.

(2) The compound (V) is reacted with the halide R₄ --X₁ by heating in the presence or absence of a base to produce the compound (VI). ##STR49## In the above formulae, R and n are as defined above, R₄ represents an alkyl group, allyl group, 2-propynyl group, a cyanoalkyl group, a hydroxyalkyl group, an epoxyalkyl group, an aralkyl group, an alkoxycarbonylalkyl group, an acyl group or nitroso group, Z₁ represents oxygen atom or the group --NH-- and X₁ represents a halogen atom.

This method will be more fully exemplified by Examples 3, 4 and 5 and provide, for example, those compounds designated by Nos. 2, 3, 5, 6, 10, 11, 12, 13, 20, 25, 26, 30, 31, 35, 36, 38, 40, 43, 44, 45, 46, 49, 51, 57, 58, 60, 64, 68, 77, 78, 79, 80, 81, 82, 83, 85, 86, 95, 96, 98, 103, 105, 106, 107, 109, 111, 113, 114, 115, 117, 118, 120, 121, 122, 123, 124, 128, 145-156, 161-172 and 174-177 hereinabove.

(3) The compound (VII) is reacted with the halide R₅ --X₁ by heating in the presence of a base to produce the compound (VIII). ##STR50## In the above formulae, R, R' and n are as defined above, R₅ represents an alkyl group, allyl group, 2-propynyl group, a hydroxyalkyl group, an alkoxyalkyl group, an alkenyloxyalkyl group, an aryloxyalkyl group, an acyloxyalkyl group or an aralkyl group and X₁ represents a halogen atom.

This method will be more fully exemplified by Example 6 and provide, for example, those compounds designated by Nos. 7, 8, 9, 14, 15, 16, 19, 32, 34, 42, 66, 67, 70, 71, 72, 73, 74, 75, 76, 92 and 93 hereinabove.

(4) The compound (IX) is reacted with the halide R₆ --X by heating in the presence or absence of a base to produce the compound (X) ##STR51## In the above formulae, R, n, X and Z₁ are as defined above and R₆ represents an alkyl group, allyl group, 2-propynyl group, a hydroxyalkyl group, an alkoxyalkyl group or an aralkyl group.

This method will be more fully exemplified by Example 7 and provide, for example, those compounds designated by Nos. 84, 88, 90, 91, 92, 99 and 119 hereinabove.

(5) The compound (XI) is reacted with formaldehyde and formic acid to produce the compound (XII). ##STR52## In the above formulae, R, n and Z₁ are as defined above and Y₁ represents oxygen atom, sulfur atom or the group ═NH.

This method will be more fully exemplified by Example 8 and provide, for example, those compounds designated by Nos. 2, 3, 10, 30, 64, 81, 85, 87, 89, 94, 97, 103, 109, 111, 115, 116, 117, 145-148 and 161-169 hereinabove.

(6) The compound (XIII) is reacted with ethylene oxide by heating under pressure in the presence of an acid to produce the compound (XIV). ##STR53## In the above formulae, R, n, Y₁ and Z are as defined above.

This method will be more fully exemplified by Example 9 and provide, for example, those compounds designated by Nos. 17 and 18 hereinabove.

(7) The compound (XV) is reacted with ethylene oxide by heating under pressure in the presence of an acid to produce the compound (XVI). ##STR54## In the above formulae, Y₁ and Z₁ are as defined above.

This method will be more fully exemplified by Example 10 and provide, for example, the compound designated by No. 39 hereinabove.

(8) The compound (XVII) or (XIX) is reacted with an acid halide in the presence of a base to produce the compound (XVIII) or (XX). ##STR55## In the above formulae, n, X₁, Y₁ and Z₁ are as defined above, the acyl moiety of the acyl halide R₈ --(COX₁)_(n) or R₈ COX₁ represents a monoacyl group, a biacyl group, a triacyl group or tetraacyl group, R₇ represents an alkyl group, allyl group, 2-propynyl group, a cycanoalkyl group, an alkoxyalkyl group, an alkenyloxyalkyl group, an aryloxyalkyl group, an epoxyalkyl group, an alkoxycarbonylalkyl group, an aralkyl group, an acyl group or nitroso group and m' is an integer of 2 through 4 inclusive.

This method will be more fully exemplified by Example 11 and provide, for example, those compounds designated by Nos. 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 121, 122, 125, 126 and 129 as well as No. 173 in combination with methode 6 hereinabove.

(9) The compound (XXI) or the alkali metal salt thereof is reacted with the halide R₉ (X₁)_(n) to produce the compound (XXII). ##STR56## In the above formulae, n, X₁ and Z₁ are as defned above. R₉ represents, when n is 1, an alkyl group, allyl group, 2-propynyl group, a hydroxyalkyl group, a cyanoalkyl group, an alkoxyalkyl group, an alkenyloxyalkyl group, an aryloxyalkyl group, an epoxyalkyl group, an acyloxyalkyl group, an alkylthioalkyl group, an alkoxycarbonylalkyl group, an aryloxycarbonylalkyl group, an aralkyl group, an alkoxycarbonyl group, an aralkyloxycarbonyl group, a substituted phosphino group or a substituted phosphinyl group; when n is 2, an alkylene group, an alkylene group, an aralkylene group, a bis(alkoxycarbonyl)alkylene group, an alkylene-bis(oxycarbonylalkyl)group or a dialkylene ether group; when n is 3, an alkanetriyl group, a tris(alkoxycarbonyl)alkane-triyl group, an alkanetriyl-tris(oxycarbonylalkyl) group or the group ##STR57## in which p is as defned above; and, when n is 4, an alkanetetrayl group, a tetrakis(alkoxycarbonyl)alkane-tetrayl group or an alkanetetrayl-tetrakis(oxycarbonylalkyl) group. R₁₀ represents an alkyl group, a cyanoalkyl group, a hydroxyalkyl group, an alkoxyalkyl group, an aralkyl group, an acyl group, an alkoxycarbonylalkyl group, an aralkyloxycarbonyl group or nitroso group.

This method will be more fully exemplified by Example 12 and provide, for example, those compounds designated by Nos. 21, 22, 23, 24, 25, 26, 32, 41, 49, 56, 58, 60, 61, 62, 63, 65, 80, 100, 101, 127, 130, 145-156, 161 and 164-169 hereinabove.

(10) The compound (XXIII) is subjected to reduction to produce the compound (XXIV). ##STR58## In the above formulae, R, n, Y and Z are as defined above.

This method will be more fully exemplified by Example 13 and provide, for example, the compound designated by No. 27 hereinabove.

(11) The compound (XXIV) is reacted with the acid halide (R₈ COX₁) in the presence of a base to produce the compound (XXV). ##STR59## In the above formulae, R, n, X₁, Y, the group R₈ CO and Z are as defined above.

This method will be more fully exemplified by Example 14 and provide, for example, the compound designated by No. 28 hereinabove.

(12) The compound (XXIV) is reacted with the halide R₁₁ X in the presence of a base to produce the compound (XXVI). ##STR60## In the above formulae, R, n, X₁, Y and Z are as defined above, R₁₁ represents an alkyl group and R₁₂ represents hydrogen atom or an alkyl group.

This method will be more fully exemplified by Example 15 and provide, for example, the compound designated by No. 29 hereinabove.

(13) The compound (XXVI) is reacted with dialkyl sulfate by heating to produce the compound (XXVII). ##STR61## In the above formulae, R, R₁₁ and n are as defined above.

This method will be more fully exemplified by Example 16 and provide, for example, those compounds designated by Nos. 8, 19, 66, 70, 71, 102, 104, 108, 110 and 112 hereinabove.

In still another aspect of this invention, there is provided a synthetic polymer composition stabilized against photo- and thermal-deterioration which contains at least one of the new piperidine derivatives (I) having incorporated therein.

The piperidine derivatives (I) employed as a stabilizer in the present invention may be readily incorporated into the synthetic polymers by any of the various standard procedures commonly utilized in the art. The stabilizer may be incorporated into the synthetic polymers at any desired stage prior to the manufacture of shaped articles therefrom. Thus, for example, the stabilizer in the form of a dry powder may be admixed with the synthetic polymer, or a suspension or emulsion of the stabilizer may be admixed with a solution, suspension or emulsion of the synthetic polymer.

The amount of the piperidine derivatives (I) employed in the synthetic polymer is accordance with the present invention may be varied widely, depending upon the types, properties and particular uses of the synthetic polymer to be stabilized. In general, the piperidine derivatives of the formula (I) may be added in an amount ranging from 0.01 to 5.0% by weight, based on the amount of the synthetic polymer, but the practical range is varied depending upon the type of the synthetic polymer, that is 0.01 to 2.0% by weight, preferably 0.02 to 1.0% by weight for polyolefins, 0.01 to 1.0% by weight, preferably 0.02 to 0.5% by weight for polyvinyl chloride and polyvinylidene chloride, and 0.01 to 5.0% by weight, preferably 0.02 to 2.0% by weight for polyurethanes and polyamides.

The present stabilizer may be used alone or in combination with other known antioxidants, ultraviolet absorbents, fillers, pigments and the like.

If desired, two or more of the present stabilizers i.e. the piperidine derivatives of the formula (I) may also be satisfactorily used in this invention.

In order that the invention may be better understood, the following Examples are given solely for the purpose of illustration of this invention. In the Examples, all parts are given by weight unless otherwise indicated and the number of the test compound as used hereinbelow is the same as illustratively shown above.

Examples 1 through 16 describe the preparation of some representative compounds of the piperidine derivative (I) of this invention.

Examples 17 through 29 describe the synthetic polymer compositions having incorporated therein the piperidine derivatives (I) and their stabilizing effects.

EXAMPLE 1 1,3,8-Triaza-3,8-dibenzyl-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4dione

To a suspension of 22.5 g. of 1,3,8-triaza-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione in 300 ml. of ethanol was added 6.2 g. of potassium hydroxide and the resulting mixture was heated under reflux for 1 hour. After cooling, acetone was added to the reaction mixture, thereby separating crystalline substance, which was then recovered by filtration to give the potassium salt of the above starting material.

To 5 g. of the potassium salt obtained above was added 30 g. of benzyl chloride and the resulting mixture was heated under reflux for 20 hours. After cooling, the reaction mixture was poured into a 10% aqueous solution of sodium hydroxide and crystalline substance so separated was recovered by filtration and recrystallized from benzene to give the desired product as white crystals melting at 262°-263° C.

Analysis for C₂₅ H₃₁ N₃ O₂ : Calculated: C, 74.10%; H, 7.65%; N, 10.37; Found: C, 74.33%; H, 7.66%; N, 10.28%.

Mass spectrum: M⁺ m/e 405 (Calculated 405).

EXAMPLE 2 1,3,8-Triaza-7,7,9,9-tetramethyl-3,8-di(2-propynyl)-spiro[4.5]decane-2,4-dione

To a mixture of 2.6 g. of potassium salt of 1,3,8-triaza-7,7,9,9-tetramethy-spiro[4.5]decane-2,4-dione, 2.6 g. of 2-propynyl bromide and 1.4 g. of potassium carbonate was added 20 ml. of dimethylformamide and the resulting mixture was heated at 80°-90° C. for 15 hours. After completion of the reaction, the reaction mixture was concentrated and the concentrate was extracted with benzene. The benzene extract was again concentrated and the residual crystalline substance was recrystallized from aqueous ethanol to give the desired product as white crystals melting at 198°-200° C.

Analysis for C₁₇ H₂₃ N₃ O₂ : Calculated: C, 67.75%; H, 7.69%; N, 13.94% Found: C, 67.70%; H, 7.73%; N, 13.89%.

EXAMPLE 3 8-Allyl-1,3,8-triaza-7,7,9,9-tetramethyl-3-n-octyl-spiro[4.5]decane-2,4-dione

To a mixture of 17 g. of 1,3,8-triaza-7,7,9,9-tetramethyl-3-n-octyl-spiro[4.5]decane-2,4-dione and 16 g. of allyl chloride were added 20 ml. of triethylamine and 20 ml. of dimethylformamide. The resulting mixture was heated under reflux for 20 hours.

After completion of the reaction, the reaction mixture was concentrated, the residue was washed with an 10% aqueous potassium carbonate solution and extracted with benzene. The benzene extract was subjected to a column chromatography on alumina and the resulting crystalline substance was recrystallized from n-hexane to give the desired product as white crystals melting at 123°-124° C.

Analysis for C₂₂ H₃₉ N₃ O₂ : Calculated: C, 70.00%; H, 10.35%; N, 11.15%; Found: C, 69.74%; H, 10.40%; N, 11.39%.

EXAMPLE 4 1,3,8-Triaza-8-benzyl-7,7,9,9-tetramethyl-3-n-octyl-spiro[4.5]decane-2,4dione

A mixture of 2 g. of 1,3,8-triaza-7,7,9,9-tetramethyl-3-n-octyl-spiro[4.5]decane-2,4-dione, 10 g. of benzyl chloride and 1 g. of potassium carbonate was heated under reflux for 15 hours. After cooling, the reaction mixture was added to an 10% aqueous potassium carbonate solution and extracted with benzene. The benzene solution so obtained was washed with water, dried over anhydrous sodium sulfate and then concentrated. The residual crystalline substance was recrystallized from petroleum ether to give the desired product as white crystals melting at 167°-168° C.

Analysis for C₂₆ H₄₁ N₃ O₂ : Calculated: C, 73.02%; H, 9.66%; N, 9.83%; Found: C, 72.83%; H, 9.53%; N, 10.00%.

IR spectrum (Nujol mull): ν_(NH) 3380, ν_(C)═O 1780, 1713 cm⁻¹.

Mass spectrum: M⁺ m/e 567 (Calculated: 567).

EXAMPLE 5 1,3,8-Triaza-3-butyl-8-(2,3-epoxypropyl)-7,7,9,9-tetramethylspiro[4.5]decane-2,4-dione

A solution of 20.0 g. of 1,3,8-triaza-3-butyl-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione in 40 g. of epichlorohydrin was refluxed with stirring for 15 hours. After completion of the reaction, excess epichlorohydrin was removed by distillation under reduced pressure and the residue was dissolved in 200 ml. of ether. The resulting solution was washed with an 20% aqueous solution of potassium carbonate and then with water. After drying over anhydrous sodium sulfate, the ether was distilled off to give the desired product as crude crystalline substances which were then recrystallized from ethyl acetate, thereby yielding the desired product in pure state as white crystals melting at 125°-128° C.

Analysis for C₁₇ H₂₇ N₃ O₃ : Calculated: C, 63.52%; H, 8.47%; N, 13.07%; Found: C, 63.49%; H, 8.51%; N, 13.15%

EXAMPLE 6 1,3,8-Triaza-1,3,8-tribenzyl-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

To 2 g. of 1,3,8-triaza-3,8-dibenzy-7,7,9,9-tetramethylspiro[4.5]decane-2,4dione were added 1 g. of sodium hydride and 40 ml. of xylene and the resulting mixture was heated under reflux for 5.5 hours. Then, 5.25 g. of benzyl chloride was added to the mixture and the mixture so obtained was heated under reflux for further 10 hours. After cooling, insoluble materials were filtered off from the reaction mixture and the filtrate was concentrated. To the residue was added 10% aqueous hydrochloric acid and the resulting mixture was washed with ether. The aqueous layer was separated from the organic layer and neutralized by addition of potassium carbonate followed by extraction with benzene. The benzene extract was concentrated and the residual crystalline substance was recrystallized from n-hexane to give the desired product as white crystals melting at 135°-136° C.

Analysis for C₃₂ H₃₇ N₃ O₂ : Calculated: C, 77.54%; H, 7.52%; N, 8.48%; Found: C, 77.42%; H, 7.91%; N, 8.50%.

EXAMPLE 7 4,4'-Bis[1,3,8-triaza-7,7,9,9-tetramethyl-2-oxo-8-(2-propynyl)-4-(2-propynylimino)-spiro[4.5]-3-decyl]diphenylmethane

To a mixture of 1 g. of 4,4'-bis(1,3,8-triaza-4-imino-7,7,9,9-tetramethyl-2-oxo-spiro-[4.5]-3-decyl) diphenylmethane, 0.9 g. of 2-propynyl bromide and 1 g. of sodium carbonate was added 10 ml. of dimethylformamide and the resulting mixture was heated at 140°-150° C. for 12 hours. After completion of the reaction, the dimethylformamide was distilled off, the residue was washed with water and then benzene and finally recrystallized from dimethylformamide to give the desired product as pale yellow crystals not melting at 250° C.

Analysis for C₄₇ H₅₆ N₈ O₂ : Calculated: C, 73.79%; H, 7.38%; N, 14.65%; Found: C, 73.86%; H, 7.45%; N, 14.54%.

IR spectrum (Nujol mull): ν_(NH) 3300 cm⁻¹, ν_(C)═O 2100 cm⁻¹ ; ν_(C)═O 1720 cm⁻¹, ν_(C)═N 1675 cm⁻¹.

EXAMPLE 8 1,3,8-Triaza-3-butyl-7,7,8,9,9-pentamethyl-spiro[4.5]decane-2,4-dione

To 281 g. of 1,3,8-triaza-3-butyl-7,7,9,9-tetramethylspiro[4.5]decane-2,4-dione was added 256 g. of 90% formic acid and to the resulting mixture was added dropwise at 20°-30° C. over 1 hour 162 g. of 37% formaldehyde. After completion of the dropwise addition, the mixture so obtained was refluxed with stirring by gradual heating for about 7 hours, at the end of which evolution of gaseous carbon dioxide ceased.

After completion of the reaction, the reaction mixture was cooled, diluted with 800 ml. of water and then neutralized to a pH of 9 to 9.5 with an 45% aqueous sodium hydroxide solution. Crystalline substances thus separated were recovered by filtration, washed with water and dried. Recrystallization from methanol gave the desired product as white crystals melting at 135°-137° C.

Analysis for C₁₆ H₂₉ N₃ O₂ : Calculated: C, 65.05%; H, 9.89%; N, 14.22%; Found: C, 65.05%; H, 9.93%; N, 14.21%.

EXAMPLE 9 1,3,8-Triaza-8-hydroxyethyl-7,7,9,9-tetramethyl-3-n-octylspiro[4.5]decane-2,4-dione

Into a sealed tube were charged 5.7 g. of 1,3,8-triaza-7,7,9,9-tetramethyl-3-n-octyl-spiro[4.5]decane-2,4-dione, 25 ml. of methanol and 0.1 ml. of hydrochloric acid. Then, 1.7 g. of ethylene oxide was added thereto. The tube was sealed and heated at 103° C. for 3 hours. After completion of the reaction, the reaction mixture was concentrated and the residue was recrystallized from ligroin to give the desired product as white crystals melting at 138°-139° C.

Analysis for C₂₁ H₃₉ N₃ O₃ : Calculated: C, 66.11%; H, 10.30%; N, 11.01%; Found: C, 65.99%; H, 10.55%; N, 10.91%.

EXAMPLE 10 1,3,8-Triaza-3,8-bis(2-hydroxyethyl)-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

A mixture of 4.5 g. of 1,3,8-triaza-7,7,9,9-tetramethylspiro[4.5]decane-2,4-dione, 20 ml. of methanol and 0.2 g. of hydrochloric acid was charged into a sealed tube. To the tube was then charged 5 g. of ethylene oxide. After sealing the tube, the mixture was heated at 110° C. for 5 hours. After completion of the reaction, insoluble substances were filtered off and the filtrate was concentrated. The residue was recrystallized from a mixture of methanol and ether to give the desired product as colorless needles melting at 188°-190° C.

Analysis for C₁₅ H₂₇ N₃ O₄ : Calculated: C, 57.51%; H, 8.69%; N, 13.42%; Found: C, 57.63%; H, 8.55%; N, 13.40%.

EXAMPLE 11 1,3,8-Triaza-3,8-bis(2-p-chlorobenzyloxyethyl)-7,7,9,9-tetramethyl-spiro[4,5]decane-2,4-dione

To a suspension of 2.5 g. of 1,3,8-triaza-3,8-bis(2-hydroxyethyl)-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione and 3.3 g. of potassium carbonate in 30 ml. of benzene was added 4.4 g. of p-chlorobenzoyl chloride at room temperature. The resulting mixture was stirred at that temperature for 2 hours and heated under reflux for additional 2 hours. After cooling, the reaction mixture was washed with water, dried over anhydrous sodium sulfate and the benzene was distilled off. The residue so obtained was recrystallized from ethyl acetate to give the desired product as white crystals melting at 202°-202.5° C.

Analysis for C₂₉ H₃₃ N₃ O₆ Cl: Calculated: C, 58.98%; H, 5.59%; N, 7.11%; Cl, 12.01%; Found: C, 58.69%; H, 5.80%; N, 6.89%; Cl, 12.36%.

IR spectrum (Nujol mull): ν_(C)═O 1768, 1729, 1710 cm⁻¹.

EXAMPLE 12 1,3.8-Triaza-3-(2,3-epoxypropyl)-7,7,8,9,9-pentamethyl-spiro[4.5]decane-2,4-dione

In 100 ml. of water was dissolved 2.4 g. of sodium hydroxide and to the resulting solution was added with stirring 12.0 g. of 1,3,8-triaza-7,7.8,9,9-pentamethyl-spiro[4.5]-decane-2.4-dione to form the corresponding sodium salt in situ. To the mixture was then added 0.56 g. of epichlorohydrin and the resulting mixture was sitrred at room temperature for 60 hours. The crystalline substance separated in situ was recovered by filtration and washed with water to give the desired product as crude crystals, which were then dissolved in 150 ml. of toluene with heating and impurities were filtered off and the filtrate was cooled to give the desired product as white crystals melting at 174°-176° C.

Analysis for C₁₅ H₂₅ N₃ O₃ : Calculated: C, 60.99%; H, 8.53%; N, 14.23%; Found: C, 60.77%; H, 8.42%; N, 14.45%.

EXAMPLE 13 8-Amino-1,3,8-triaza-3-butyl-7,7,9,9-tetramethyl-spiro[4.5]-decane-2,4-dione

To 9.3 g. of 1,3,8-triaza-3-butyl-7,7,9,9-tetramethyl-8-nitroso-spiro[4.5]decane-2,4-dione were added 11.2 g. of zinc powder and 35 ml. of water and to the resulting mixture was added 25 ml. of 85% acetic acid. The mixture so obtained was heated at 60°-65° C. for 1.5 hours. After cooling, sodium hydroxide was added to the reaction mixture, which was then extracted with benzene. The benzene extract was dried over anhydrous sodium sulfate and concentrated. The residue was recrystallized from petroleum benzine to give the desired product as white crystals melting at 154°-156° C.

Analysis for C₁₅ H₂₈ N₄ O₂ : Calculated: C, 60.78%; H, 9.52%; N, 18.90%; Found: C, 60.50%; H, 9.57%; N, 18.69%.

IR spectrum (Nujol mull): ν_(C)═O 1770, 1708 cm⁻¹.

EXAMPLE 14 1,3,8-Triaza-8-benzamido-3-butyl-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

To a solution of 2 g. of 8-amino1,3,8-triaza-3-butyl-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione and 2 g. of triethylamine in 50 ml. of benzene was added 1.2 g. of benzoyl chloride and the resulting mixture was stirred at 40°-50° C. for 5 hours. After completion of the reaction, the reaction mixture was concentrated and to the residue was added water followed by filtration. The crystalline substances so separated were recrystallized from benzene to give the desired product as white crystals melting at 235°-236° C.

Analysis for C₂₂ H₃₂ N₄ O₃ : Calculated: C, 65.97%; H, 8.05%; N, 13.99%; Found: C, 65.61%; H, 7.99%; N, 13.94%.

IR spectrum (Nujol mull): ν_(C)═O 1762, 1710, 1690 cm⁻¹.

EXAMPLE 15 1,3,8-Triaza-3-butyl-8-ethylamino-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione

To a solution of 0.45 g. of 8-amino-1,3,8-triaza-3-butyl-7,7,9,9-tetramethyl-spiro[4.5]-decane-2,4-dione and 2 g. of potassium carbonate in 10 ml. of dimethylformamide was added 1 g. of ethyl iodide and the resulting mixture was heated at 100°-105° C. for 8 hours. After completion of the reaction, the reaction mixture was concentrated and to the residue was added water followed by filtration. The crystalline substances so separated were recrystallized from petroleum benzine to give the desired product as white crystals melting at 138°-139° C.

Analysis for C₁₇ H₃₂ N₄ O₂ : Calculated: C, 62.93%; H, 9.94%; N, 17.27%; Found: C, 63.20%; H, 10.09%; N, 17.01%.

Mass spectrum: M⁺ 324 (Calculated Molecular Weight 324.46).

EXAMPLE 16 1,6-Bis (1,3,8-triaza-1,7,7,8,9,9-hexamethyl-2,4-dioxo-spiro[4.5]-3-decyl)hexane

To a solution of 2.66 g. of 1,6-bis(1,3,8-triaza-7,7,9,9-tetramethyl-2,4-dioxo-spiro[4.5]-3-decyl)hexane and 3.2 g. of sodium hydroxide in 50 ml. of dioxane was added 5 g. of dimethyl sulfate and the resulting mixture was heated at 60°-65° C. for 3 hours. After completion of the reaction, the reaction mixture was concentrated and the residue was extracted with benzene. The benzene extract was washed with water, dried over anhydrous sodium sulfate and then concentrated. The residue was recrystallized from petroleum benzine to give the desired product as white crystals melting at 125°-126° C.

Analysis for C₃₂ H₅₆ N₆ O₄ : Calculated: C, 65.27%; H, 9.59%; N, 14.27%; Found: C, 65.57%; H, 9.55%; N, 13.95%.

IR spectrum (Nujol mull): Ξ_(C)═O 1762, 1700 cm⁻¹.

By utilizing any suitable procedure of those set forth in the above Examples, the following compounds were prepared:

1,3,8-triaza-3,7,7,8,9,9-hexamethyl-spiro[4.5]decane-2,4-dione (m.p. 209°-210° C.),

1,3,8-triaza-7,7,8,9,9-pentamethyl-3-octyl-spiro[4.5]decane-2,4-dione (m.p. 127°-128° C.),

1,3,8-triaza-3,8-diethyl-7,7,9,9-tetramethyl-spiro[4.5]-decane-2,4-dione (m.p. 162°-164° C.),

1,3,8-triaza-3-butyl-8-ethyl-7,7,9,9-tetramethyl-spiro[4.5]-decane-2,4-dione (m.p. 105°-107° C.),

1,3,8-triaza-8-ethyl-7,7,9,9-tetramethyl-3-octyl-spiro[4.5]-decane-2,4-dione (m.p. 137°-138° C.),

1,3,8-triaza-1,3,7,7,8,9,9-heptamethyl-spiro[4.5]decane-2,4-dione (m.p. 81°-82° C.),

1,3,8-triaza-3-butyl-1,8-diethyl-7,7,9,9-tetramethyl-spiro[4.5]-decane-2,4-dione (colorless liquid after chromatography),

1,3,8-triaza-1-butyl-8-ethyl-7,7,9,9-tetramethyl-3-octyl-spiro-[4.5]decane-2,4-dione (b.p. 195°-200° C./3 mmHg.),

3,8-diaza-7,7,8,9,9-pentamethyl-3-octadecyl-1-oxa-spiro[4.5]decane-2,4-dione (m.p. 83°-84° C.),

1,3,8-triaza-8-benzyl-7,7,9,9-tetramethyl-3-octadecyl-spiro[4.5]decane-2,4-dione (m.p. 111°-113° C.),

1,3,8-triaza-3,7,7,8,9,9-hexamethyl-1-ethoxymethyl-spiro[4.5]decane-2,4-dione (b.p. 161°-162° C./0.9 mmHg.),

1,3,8-triaza-3,7,7,8,9,9-hexamethyl-1-(2-phenoxyethyl)-spiro-[4.5]decane-2,4-dione (m.p. 92°-93° C.),

1,3,8-triaza-3,7,7,8,9,9-hexamethyl-1-(2-vinyloxyethyl)-spiro-[4.5]decane-2,4-dione (b.p. 171°-172° C./0.9 mmHg.),

1,3,8-triaza-3-butyl-8-(2-hydroxyethyl)-7,7,9,9-tetramethyl-spiro[4,5]decane-2,4-dione (m.p. 122°-114° C.),

1,3,8-triaza-8-(2-cyanoethyl)-1,3,7,7,9,9-hexamethyl-spiro[4.5]decane-2,4-dione (m.p. 23°-26° C.),

1,3,8-triaza-8-(2-ethoxyethyl)-3,7,7,9,9-pentamethyl-spiro[4.5]decane-2,4-dione (m.p. 135°-136° C.),

1,3,8-triaza-8-cinnamoyl-3,7,7,9,9-pentamethyl-spiro[4.5]decane-2,4-dione (m.p. 279°-280° C.),

1,3,8-triaza-3,7,7,9,9-pentamethyl-8-nitroso-spiro[4.5]decane-2,4-dione (m.p. 228°-229° C.),

1,3,8-triaza-3-butyl-7,7,9,9-tetramethyl-8-nitroso-spiro[4.5]decane-2,4-dione (m.p. 131°-132° C.),

3-allyl-1,3,8-triaza-7,7,8,9,9-pentamethyl-spiro[4.5]decane-2,4-dione (m.p. 137°-139° C.),

3-allyl-1,3,8-triaza-8-ethyl-7,7,9,9-tetramethyl-spiro[4.5]-decane-2,4-dione (m.p. 166°-167° C.),

1,3-diallyl-1,3,8-triaza-7,7,8,9,9-pentamethyl-spiro[4.5]-decane-2,4-dithione (b.p. 174°-176° C./3 mmHg.),

3,8-diallyl-1,3,8-triaza-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione (m.p. 154°-155° C.),

3,8-diallyl-1,3,8-triaza-1-benzyl-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione (b.p. 205°-207° C./1 mmHg.),

3-allyl-1,3,8-triaza-8-(2,3-epoxypropyl)-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione (m.p. 162°-164° C.),

3-allyl-1,3,8-triaza-8-benzyl-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione (m.p. 189°-190° C.),

1,3,8-triaza-8-(2,3-epoxypropyl)-7,7,9,9-tetramethyl-3-(2-propynyl)-spiro[4.5]decane-2,4-dione (m.p. 193.5°-196.5° C.),

1,3,8-triaza-8-cyanomethyl-3-(3-hydroxypropyl)-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione (m.p. 191°-192° C.),

1,3,8-triaza-1,7,7,9,9-pentamethyl-3,8-bis(2-methoxyethyl)-spiro[4.5]decane-2,4-dione (m.p. 34°-36° C.),

1,3,8-triaza-3-ethoxymethyl-7,7,8,9,9-pentamethyl-spiro[4.5]-decane-2,4-dione (m.p. 176°-177° C.),

1,3,8-triaza-8-ethyl-7,7,9,9-tetramethyl-3-(2-vinyloxyethyl)-spiro[4.5]decane-2,4-dione (m.p. 149°-150° C.),

8-allyl-1,3,8-triaza-7,7,9,9-tetramethyl-3-(2-phenoxyethyl)-spiro[4.5]decane-2,4-dione (m.p. 175°-176° C.),

3-(2-acetoxyethyl)-1,3,8-triaza-8-benzyl-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione (m.p. 191°-191.5° C.),

3,8-bis(2-acetoxyethyl)-1,3,8-triaza-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione (m.p. 149°-150° C.),

1,3,8-triaza-2,2,6,6-tetramethyl-3,8-bis(2-octanoyloxyethyl)-spiro[4.5]decane-2,4-dione (m.p. 69°-70° C.),

8-acryloyl-3-(2-acryloyloxyethyl)-1,3,8-triaza-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione (m.p. 173°-174° C.),

3,8-bis(2-acryloyloxyethyl)-1,3,8-triaza-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione (m.p. 119°-120° C.),

1,3,8-triaza-3-(2-benzoyloxyethyl)-8-ethyl-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione (m.p. 166°-167° C.),

1,3,8-triaza-3,8-bis(2-benzoyloxyethyl)-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione (m.p.187°-188.5° C.),

1,3,8-triaza-7,7,9,9-tetramethyl-3,8-bis(2-m-toluoyloxyethyl)-spiro[4.5]-decane-2,4-dione (m.p. 152°-153° C.),

3,8-bis(2-o-anisoyloxyethyl)-1,3,8-triaza-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione (m.p. 141°-142° C.),

1,3,8-triaza-3,8-bis(2-cyanoethyl)-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione (m.p. 126°-127° C.)

1,3,8-triaza-7,7,8,9,9-pentamethyl-3-(2-methylthioethyl)-spiro[4.5]decane-2,4-dione (m.p. 138°-139° C.),

1,3,8-triaza-3,8-bis(2,3-epoxypropyl)-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione (m.p. 164.5°-166.5° C.),

1,3,8-triaza-3-ethoxycarbonylmethyl-7,7,8,9,9-pentamethyl-spiro[4.5]decane-2,4-dione (m.p. 145°-146° C.),

1,3,8-triaza-3-ethoxycarbonyl-7,7,8,9,9-pentamethyl-spiro[4.5]decane-2,4-dione (m.p. 133°-134° C.),

1,3,8-triaza-3-benzyl-7,7,8,9,9-pentamethyl-spiro[4.5]-decane-2,4-dione (m.p. 206°-208.5° C.),

1,3,8-triaza-3-benzyl-7,7,9,9-tetramethyl-8-octyl-spiro[4.5]decane-2,4-dione (m.p. 175°-176° C.),

1,3,8-triaza-3-benzyl-1,8-diethyl-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione (colorless liquid after chromatography),

1,3,8-triaza-1,3-dibenzyl-7,7,8,9,9-pentamethyl-spiro[4.5]decane-2,4-dithione (m.p. 101°-102° C.),

1,3,8-triaza-7,7,9,9-tetramethyl-3-phenethyl-8-(2-propynyl)spiro[4.5]decane-2,4-dione (m.p. 194°-195° C.),

1,3,8-triaza-3,8-dibenzyl-1,7,7,9,9-pentamethyl-spiro[4.5]-decane-2,4-dione (m.p. 132°-133° C.),

1,3,8-triaza-3,8-dibenzyl-1-butyl-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione (m.p. 133.5°-134° C.),

1-(2-acetoxyethyl)-1,3,8-triaza-3,8-dibenzyl-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione (colorless liquid after chromatography),

1,3,8-triaza-1-(2-benzoyloxyethyl)-3,8-dibenzyl-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione (colorless liquid after chromatography),

1,3,8-triaza-3,8-dibenzyl-7,7,9,9-tetramethyl-1-(2-propynyl)spiro[4.5]decane-2,4-dione (m.p. 123.5°-124.5° C.),

1,3,8-triaza-3-benzyl-8-(2,3-epoxypropyl)-7,7,9,9-tetramethylspiro[4.5]decane-2,4-dione (m.p. 197°-199.5° C.),

1,3,8-triaza-7,7,8,9,9-pentamethyl-3-(p-methylbenzyl)-spiro[4.5]decane-2,4-dione (m.p. 162°-163° C.),

1,3,8-triaza-3-(p-chlorobenzyl)-7,7,8,9,9-pentamethyl-spiro[4.5]decane-2,4-dione (m.p. 170.5°-171.5° C.),

8-acryloyl-1,3,8-triaza-3-benzyl-7,7,9,9-tetramethyl-spiro[4.5]decane-2.4-dione (m.p. 131°-132° C.),

1,3,8-triaza-3-cyclohexyl-7,7,8,9,9-pentamethyl-spiro[4.5]decane-2,4-dione (m.p. 186°-188° C.),

1,3,8-triaza-3-cyclohexyl-8-(2,3-epoxypropyl)-7,7,9,9-tetramethylspiro[4.5]decane-2,4-dione (m.p. 179°-182.5° C.),

1,3,8-triaza-8-benzyl-3-cyclohexyl-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione (m.p. 237°-238° C.),

1,3,8-triaza-8-benzyl-4-benzylimino-3-cyclohexyl-7,7,9,9-tetramethyl-spiro[4.5]decane-2-one (m.p. 203°-204° C.),

1,3,8-triaza-7,7,8,9,9-pentamethyl-3-phenyl-spiro[4.5]decane-2,4-dione (m.p. 156° C.),

1,3,8-triaza-8-(2,3-epoxypropyl)-7,7,9,9-tetramethyl-3-phenylspiro[4.5]decane-2,4-dione (m.p. 179°-182.5° C.),

1,3,8-triaza-4-imino-7,7,8,9,9-pentamethyl-3-phenyl-spiro[4.5]decane-2-one (m.p. 140°-141° C.),

1,3,8-triaza-7,7,8,9,9-pentamethyl-4-methylimino-3-phenyl-spiro[4.5]decane-2-one (m.p. 204° C.),

1,3,8-triaza-4-imino-7,7,8,9,9-pentamethyl-3-phenyl-spiro[4.5]decane-2-thione (m.p. 140°-142° C.),

8-allyl-4-allylimino-1,3,8-triaza-7,7,9,9-tetramethyl-3-phenyl-spiro[4.5]decane-2-one (m.p. 120°-121° C.),

1,3,8-triaza-8-(2-hydroxyethyl)-4-(2-hydroxyethylimino)-7,7,9,9-tetramethyl-3-phenyl-spiro[4.5]decane-2-one (m.p. 225°-226° C.),

1,3,8-triaza-1,7,7,9,9-pentamethyl-8-(2-methoxyethyl)-4-(2-methoxyethylimino)-3-phenyl-spiro[4.5]decane-2-one (m.p. 131°-132° C.),

1,3,8-triaza-1,8-dibenzyl-7,7,9,9-tetramethyl-3-phenyl-spiro[4.5]decane-4-one-2-thione (m.p. 202°-203° C.),

3,8-diaza-4-imino-7,7,8,9,9-pentamethyl-3-(α-naphthyl)-1-oxa-spiro[4.5]decane-2-thione (m.p.>260° C.),

1,3,8-triaza-8-benzyl-7,7,9,9-tetramethyl-3-(p-tolyl)-spiro[4.5]decane-2,4-dione (m.p. 259°-260° C.),

3,8-diaza-7,7,8,9,9-pentamethyl-1-oxa-3-(p-tolyl)-spiro[4.5]decane-2,4-dione (m.p. 166°-167° C.),

3,8-diaza-4-imino-7,7,8,9,9-pentamethyl-1-oxa-3-(p-tolyl)spiro[4.5]decane-2-one (m.p. 163°-164° C.),

3,8-diaza-3-(c-chlorophenyl)-7,7,8,9,9-pentamethyl-1-oxa-spiro[4.5]decane-2,4-dione (m.p. 190°-191° C.),

3,8-diaza-3-(o-chlorophenyl)-7,7,8,9,9-pentamethyl-4-methylimino-1-oxa-spiro[4.5]decane-2-one (m.p. 181°-182° C.),

1,3,8-triaza-7,7,8,9,9-pentamethyl-3-diphenoxyphosphinylspiro[4.5]decane-2,4-dithione (m.p. 176°-177° C.),

1,3-bis(1,3,8-triaza-1,7,7,8,9,9-hexamethyl-2,4-dioxo-spiro[4.5]-3-decyl)propane (m.p. 117°-118° C.),

1,6-bis(1,3,8-triaza-7,7,8,9,9-pentamethyl-2,4-dioxo-spiro[4.5]-3-decyl)hexane (m.p. 231°-234° C.),

1,6-bis[1,3,8-triaza-7,7,9,9-tetramethyl-2,4-dioxo-8-(2-propynyl)-spiro[4.5]-3-decyl]hexane (m.p. 231°-232° C.),

1,6-bis[1,3,8-triaza-8-(2,3-epoxypropyl)-7,7,9,9-tetramethyl-2,4-dioxo-spiro[4.5]-3-decyl]hexane (m.p. 263.5°-268.5° C.),

1,6-bis(1,3,8-triaza-8-benzyl-7,7,9,9-tetramethyl-2,4-dioxo-spiro[4.5]-3-decyl)hexane (m.p. 281°-283° C.),

1,4-bis(1,3,8-triaza-1,7,7,8,9,9-hexamethyl-2,4-dioxo-spiro[4.5]-3-decyl)-trans-2-butene (m.p. 175°-177° C.),

2,2'-bis(1,3,8-triaza-7,7,8,9,9-pentamethyl-2,4-dioxo-spiro[4.5]-3-decyl)diethylether (m.p. 235°-236° C.),

2,2'-bis(1,3,8-triaza-1,7,7,8,9,9-hexamethyl-2,4-dioxo-spiro[4.5]-3-decyl)diethylether (m.p. 92°-93° C.),

α,α'-bis(1,3,8-triaza-7,7,8,9,9-pentamethyl-2,4-dioxo-spiro[4.5]-3-decyl)-p-xylenen (m.p. 293°-295° C.),

α,α'-bis(1,3,8-triaza-1,7,7,8,9,9-hexamethyl-2,4-dioxo-spiro[4.5]-3-decyl)-p-xylene (m.p. 197°-199° C.),

α,α'-bis[1,3,8-triaza-8-(2,3-epoxypropyl)-7,7,9,9-tetramethyl-2,4-dioxo-spiro[4.5]-3-decyl]-p-xylene (m.p. 254°-258° C.),

α,α'-bis(1,3,8-triaza-8-benzyl-7,7,9,9-tetramethyl-2,4-dioxospiro[4.5]-3-decyl)-p-xylene (m.p.>300° C.),

2,4-bis(1,3,8-triaza-7,7,8,9,9-pentamethyl-2,4-dioxo-spiro[4.5]-3-decyl)toluene (m.p.>300° C.),

2,4-bis(3,8-diaza-4-imino-7,7,8,9,9-pentamethyl-1-oxa-2-oxospiro[4.5]-3-decyl)toluene (m.p. 243°-245° C.),

4,4'-bis(1,3,8-triaza-7,7,8,9,9-pentamethyl-2,4-dioxo-spiro[4.5]-3-decyl)diphenylmethane (m.p. 238°-242.4° C.),

4,4'-bis[1,3,8-triaza-8-(2,3-epoxypropyl)-7,7,9,9-tetramethyl-2,4-dioxo-spiro[4.5]-3-decyl]diphenylmethane (m.p. 232°-236° C.),

bis[2-(1,3,8-triaza-7,7,8,9,9-pentamethyl-2,4-dioxo-spiro[4.5]-3-decyl)ethyl]adipate (m.p. 206°-210° C.),

bis[2-(1,3,8-triaza-7,7,8,9,9-pentamethyl-2,4-dioxo-spiro[4.5]-3-decyl)ethyl]terephthalate (m.p. 272°-273° C.),

tris[2-(1,3,8-triaza-7,7,8,9,9-pentamethyl-2,4-dioxo-spiro[4.5]-3-decyl)ethyl]trimellitate (m.p. 289°-292° C. with decomposition),

2,2',2"-tris[1,3,8-triaza-8-(2,3-epoxypropyl)-7,7,9,9-tetramethyl-2,4-dioxo-spiro[4.5]-3-decyl]triethyl-isocyanurate (m.p. 215°-220° C.),

tetrakis[2-(1,3,8-triaza-7,7,8,9,9-pentamethyl-2,4-dioxo-spiro[4.5]-3-decyl)ethyl]pyromellitate (m.p.>250° C.),

pentaerythritol tetrakis(1,3,8-triaza-7,7,8,9,9-pentamethyl-2,4-dioxo-spiro[4.5]-3-decylmethylcarboxylate) (m.p. 250° C.),

1,3,8-triaza-3-octyl-8-acetyl-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione (m.p. 74° C.),

1,3,8-triaza-3-butyl-8-octyl-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione (m.p. 132° C.),

1,3,8-triaza-3-butyl-8-acetoxyethyl-7,7,9,9-tetramethylspiro[4.5]decane-2,4-dione (m.p. 137° C.),

1,3,8-triaza-3-butyl-8-ethoxycarbonylmethyl-7,7,9,9-tetramethylspiro[4.5]decane-2,4-dione (m.p. 112° C.),

1,3,8-triaza-3-cyclohexyl-8-propyl-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione (m.p. 175° C.),

3-butyl-8-methoxyethyl-7,7,9,9-tetramethyl-1,3,8-triazaspiro[4.5]decane-2,4-dione (m.p. 112° C.),

3-stearyl-8-allyl-7,7,9,9-tetramethyl-1,3,8-triaza-spiro[4.5]decane-2,4-dione (m.p. 91° C.),

3,8-bis(octoxycarbonylmethyl)-1,3,8-triaza-7,7,9,9-tetramethylspiro[4.5]decane-2,4-dione (m.p. 44°-45.5° C.)

3,8-bis(2-hydroxy-2-phenylethyl)-1,3,8-triaza-7,7,9,9-tetramethylspiro[4.5]decane-2,4-dione (m.p. 215°-217° C.) and

3,8-bis(2-benzoyloxy-2-phenylethyl)-1,3,8-triaza-7,7,9,9-tetramethyl-spiro[4.5]decane-2,4-dione (m.p. 130°-132° C.)

EXAMPLE 17

Into 100 parts of polypropylene ["Noblen JHH-G", trade name, available from Mitsui Toatsu Chemicals Inc., Japan, employed after twice recrystallizations from monochlorobenzene] was incorporated 0.25 part of each of the test compounds of this invention indicated below. The resulting mixture was mixed and melted and then molded into a sheet having a thickness of 0.5 mm. under heating and pressure.

As a control, the polypropylene sheet was prepared in a similar manner to that described above without any of stabilizers for comparative purpose.

Then, all of these sheets thus formed were tested for the brittleness time (which means the time, expressed in terms of hour, until the test sheet will become brittle) under ultraviolet ray irradiation at a temperature of 45° C. by means of the fade meter prescribed in Japanese Industrial Standard JIS-1044 entitled "Testing Method of Color Fastness to Light of Dyed Textiles and Dyestuffs", Paragraph 3.8 (in English).

The results are given in the following Table 1.

                  Table 1                                                          ______________________________________                                         Test compound                                                                             Brittleness                                                                               Test compound                                                                               Brittleness                                 No.        time (hour)                                                                               No.          time (hour)                                 ______________________________________                                         1          760        32           420                                         2          800        33           920                                         3          820        34           980                                         4          700        35           800                                         5          680        36           900                                         6          1060       37           680                                         7          800        38           740                                         8          620        39           660                                         9          1280       40           700                                         10         220        42           780                                         11         1100       43           680                                         12         1020       44           640                                         13         1120       45           680                                         14         580        46           600                                         15         500        47           840                                         16         620        48           660                                         17         640        49           580                                         18         880        50           700                                         19         720        51           620                                         20         800        52           560                                         21         480        53           520                                         22         540        54           6                                           23         520        55           500                                         25         460        56           640                                         26         520        57           420                                         27         440        58           1420                                        28         580        59           1160                                        29         620        60           620                                         30         940        63           540                                         31         800        64           620                                         65         520        96           280                                         66         560        97           240                                         67         360        98           240                                         68         480        99           260                                         69         740        101          380                                         70         820        102          940                                         71         660        103          820                                         72         740        104          980                                         73         620        105          620                                         74         680        106          940                                         75         660        107          840                                         76         1080       108          600                                         77         720        109          880                                         78         680        110          880                                         79         580        111          580                                         80         660        112          820                                         81         740        113          820                                         82         620        114          920                                         83         800        115          580                                         84         580        116          460                                         85         540        117          560                                         86         660        118          980                                         87         500        119          500                                         88         560        120          860                                         89         320        121          680                                         90         480        122          520                                         91         460        126          640                                         92         540        128          1020                                        93         640        129          720                                         94         220        130          800                                         95         780                                                                                       None         100                                         ______________________________________                                    

EXAMPLE 18

Into 100 parts of high-density polyethylene ["Hi-Zex", trade name, available from Mitsui Toatsu Chemicals Inc., Japan, employed after twice recrystallizations from toluol] were incorporated 0.25 part of each of the test compounds of this invention indicated below. The resulting mixture was made into a sheet by the same procedure as in the above Example 17.

The sheet thus formed was tested for the brittleness time by the same test method as in the above Example 17. The results are given in the following Table 2.

                  Table 2                                                          ______________________________________                                         Test compound                                                                             Brittleness                                                                               Test compound                                                                               Brittleness                                 No.        time (hour)                                                                               No.          time (hour)                                 ______________________________________                                         1          1360       21           840                                         2          1880       22           880                                         3          1720       23           820                                         4          1320       25           1080                                        5          1400       26           1160                                        6          2500       27           860                                         7          2320       28           1220                                        8          1240       29           1300                                        9          2660       30           1980                                        10         580        31           1820                                        11         2480       32           920                                         12         2280       33           1900                                        13         1960       34           2020                                        14         1020       35           2100                                        15         920        36           1920                                        16         1140       37           1580                                        17         1360       38           1280                                        18         1900       39           1300                                        19         1540       40           1480                                        20         1800       42           1660                                        43         1520       81           1280                                        44         1440       82           1140                                        45         1500       83           1760                                        46         1320       84           960                                         47         2040       85           960                                         48         1260       86           1180                                        49         1220       87           820                                         50         1280       88           980                                         51         1200       89           760                                         52         1040       90           820                                         53         1000       91           780                                         54         1260       92           920                                         55         980        93           1180                                        56         1140       94           540                                         57         860        95           1580                                        58         2800       96           600                                         59         2080       97           560                                         60         1100       98           500                                         63         960        99           560                                         64         1020       101          660                                         65         900        102          2280                                        66         1100       103          1360                                        67         780        104          2300                                        68         860        105          1120                                        69         1300       106          1580                                        70         2080       107          1400                                        71         1120       108          1080                                        72         1220       109          1800                                        73         1140       110          1760                                        74         1200       111          1020                                        75         1080       112          1440                                        76         2100       113          1580                                        77         2040       114          1820                                        78         1240       115          1100                                        79         1060       116          800                                         80         1040       117          1080                                        118        1640       126          1140                                        119        9960       128          1880                                        120        1680       129          1300                                        121        1320       130          1440                                        122        940                                                                                       None         400                                         ______________________________________                                    

EXAMPLE 19

A number of sheets prepared in the above Examples 17 and 18 were aged under the following condition to determine the brittleness time.

Aging test

Aging at 120° C. for the polypropylene and 125° C. for the polyethylene in a Geer's aging tester prescribed in Japanese Industrial Standard JIS-K-6301 entitled "Physical Testing Methods for Vulcanized Rubber", Paragraph 6.5 (in English).

The results are given in the following Table 3.

                  Table 3                                                          ______________________________________                                         Test compound                                                                             Brittleness time (hour)                                             No.        Polypropylene                                                                              High-density polyethylene                               ______________________________________                                         20         220         240                                                     35         240         300                                                     38         280         360                                                     58         1320        840                                                     59         432         408                                                     77         400         380                                                     86         320         340                                                     102        960         620                                                     104        824         680                                                     110        744         628                                                     112        720         504                                                     118        808         552                                                     128        950         600                                                     None       not more than 20                                                                            40                                                     ______________________________________                                    

EXAMPLE 20

Into 100 parts of polystyrene ["Styron 666", trade name, available from Asahi-Dow Limited, Japan] was incorporated 0.25 part of each of the test compounds of this invention indicated below. The resulting mixture was made into a sheet having the thickness of 0.5 mm. as shown in the above Example 17.

The sheet thus formed was placed in a fade meter under ultraviolet ray irradiation at a temperature of 45° C. for 100 hours.

Then, infrared spectrum of the sheet was compared at 1700 cm⁻¹ to determine the increase in a number of carbonyl group.

The results are given in the following Table 4.

                  Table 4                                                          ______________________________________                                         Test compound  Increase in absorbancy                                          No.            1700 cm.sup.-1                                                  ______________________________________                                         1              5                                                               2              4                                                               3              4                                                               7              5                                                               11             4                                                               12             3                                                               35             3                                                               47             3                                                               58             3                                                               59             3                                                               69             5                                                               76             3                                                               77             3                                                               104            3                                                               112            3                                                               114            4                                                               117            4                                                               None           13                                                              ______________________________________                                    

EXAMPLE 21

Into 100 parts of polyvinyl chloride ["Geon-103 EP", trade name, available from The Japanese Geon Co., Ltd., Japan] were incorporated 30 parts of ABS resin ["ABS 60", trade name, available from The Japan Synthetic Rubber Co., Ltd., Japan], 3 parts of tribasic lead sulfate, 2 parts of dibasic lead phosphate, 2 parts of lead stearate and 1 part of each of the test compounds of this invention indicated below. The resulting mixture was blended and kneaded for 8 minutes on a kneading roll at 160° C. and then formed into a sheet having a thickness of about 0.5 mm. The sheet was subjected to the exposure to ultraviolet ray for 50 hours and then tested for the retention of ultimate elongation and ultimate tensile strength according to a conventional method.

The results are given in the following Table 5.

                  Table 5                                                          ______________________________________                                         Test compound                                                                             Retention of ultimate                                                                         Retention of ultimate                                No.        elongation (%) tensile strength(%)                                  ______________________________________                                          3         55             88                                                    7         52             87                                                   11         65             91                                                   12         61             86                                                   20         63             90                                                   33         66             93                                                   50         53             89                                                   69         57             87                                                   76         59             87                                                   106        63             91                                                   114        60             92                                                   None       42             82                                                   ______________________________________                                    

EXAMPLE 22

Into 100 parts of polyvinyl chloride ["Geon 103 EP", trade name, available from The Japanese Geon Co., Ltd., Japan] were incorporated 1 part of lead stearate, 0.5 part of dibasic lead phosphite, 0.5 part of barium stearate, 0.5 part of cadmium stearate and 0.2 part of each of the test compounds of this invention indicated below. The resulting mixture was blended and kneaded for 4 minutes on a kneading roll at 180° C. and then formed into a sheet having a thickness of 0.5 mm. The sheet was tested for the discoloration degree thereof by the aging test method set forth below.

Aging test

1. Exposure to the sunshine carbon apparatus prescribed in Japanese Industrial Standard JIS Z-0230 entitled "Accelerated Weathering test of Rust Proofing Oils", Paragraph 2 for 600 hours.

2. The sheet was aged for 90 minutes at 170° C. in the Geer's aging tester prescribed in the above Example 19. The results are given in the following Table 6.

                  Table 6                                                          ______________________________________                                                     Sunshine carbon                                                                              Geer's aging tester                                  Test compound                                                                              apparatus after                                                                              after 90 minutes,                                    No.         600 hours     170° C.                                       ______________________________________                                          2          yellow        pale yellow                                           7          yellow        pale yellow                                          11          yellow        pale yellow                                          12          pale yellow   pale yellow                                          33          yellow        yellow                                               58          pale yellow   pale yellow                                          69          pale yellow   pale yellow                                          76          pale yellow   pale yellow                                          114         pale yellow   pale yellow                                          None        dark brown    black                                                ______________________________________                                    

EXAMPLE 23

Into 100 parts of 6-nylon ["CM 1011", trade name, available from Toray Industries Inc., Japan, containing no stabilizer] was incorporated 0.25 part of each of the test compounds of this invention indicated below. The resulting mixture was heated and melted and then molded into a film having a thickness of about 0.1 mm. under pressure. The film thus formed was aged under the following aging condition and thereafter subjected to a tensile test to determine the retentions of ultimate tensile strength and ultimate elongation by a standard method.

Aging test

1. Exposure to ultraviolet ray for 200 hours in the fade meter described above at 45° C.

2. The sheet was aged for 2 hours at 160° C. in the Geer's aging tester prescribed in the above Example 19.

The results are given in the following Table 7.

                  Table 7                                                          ______________________________________                                                              Geer's aging tester,                                      Fade meter, 200 hours                                                                               2 hours, 160° C.                                                      Retention         Retention                                 Test    Retention of                                                                              of ultimate                                                                              Retention                                                                              of ultimate                               compound                                                                               ultimate   tensile   of ultimate                                                                            tensile                                   No.     elongation strength  elongation                                                                             strength                                  ______________________________________                                         1       47         68        73      79                                        7       51         70        74      78                                        11      32         62        77      72                                        12      83         72        70      77                                        18      62         68        68      73                                        20      78         70        81      72                                        33      55         60        63      65                                        58      83         78        87      77                                        69      96         76        70      75                                        76      91         73        72      78                                        107     86         74        78      70                                        None    18         55        31      71                                        ______________________________________                                    

EXAMPLE 24

Into 100 parts of polyurethane prepared from polycaprolactone ["E-5080", trade name, available from The Nippon Elastollan Industries Ltd., Japan] was incorporated 0.5 part of each of the test compounds of this invention indicated below. The resulting mixture was heated and melted and then molded into a sheet having a thickness of about 0.5 mm. The sheet thus formed was subjected to the exposure to ultraviolet ray for 15 hours in the fade meter as specified in the above Example 17 at 45° C. and then tested for the retentions of ultimate elongation and ultimate tensile strength as in the above Example 21.

The results are given in the following Table 8.

                  Table 8                                                          ______________________________________                                         Test compound                                                                             Retention of ultimate                                                                         Retention of ultimate                                No.        elongation     tensile strength                                     ______________________________________                                         3          100            95                                                   8          92             88                                                   11         88             76                                                   12         91             90                                                   20         89             78                                                   30         87             83                                                   33         90             88                                                   47         86             75                                                   58         97             91                                                   69         94             97                                                   76         90             92                                                   107        97             94                                                   117        88             92                                                   None       86             56                                                   ______________________________________                                    

EXAMPLE 25

Into 100 parts of polyacetal resin ["Delrin 500", trade name, available from Showa Neoprene K. K., Japan] was incorporated 0.5 part of each of the test compounds of this invention indicated below. The resulting mixture was heated and melted at 220° C.

The film thus formed was aged by heating at 222° C. in air for 30 minutes to determine the reduction in weight of the film.

The results are given in the following Table 9.

                  Table 9                                                          ______________________________________                                         Test compound Reduction in weight at 222° C.                            No.           after 30 minutes (%)                                             ______________________________________                                         1             0.33                                                             8             0.45                                                             11            0.38                                                             13            0.24                                                             35            0.34                                                             58            0.30                                                             69            0.34                                                             70            0.35                                                             76            0.31                                                             104           0.35                                                             None          0.77                                                             ______________________________________                                    

EXAMPLE 26

Into 100 parts of polyester resin ["Ester-G13", trade name, available from Mitsui Toatsu Chemicals, Inc., Japan] were incorporated 1 part of benzoyl peroxide and 0.2 part of each of the test compounds of this invention indicated below. The resulting mixture was mixed and pre-heated at 60° C., for 30 minutes. Then, the pre-heated mixture was cured by heating at 100° C., for 1 hour to form into a plate having a thickness of 3 mm.

The plate thus formed was subjected to the exposure to the sunshine carbon apparatus for 60 hours and then the coloration degree thereof was determined.

The results are given in the following Table 10.

                  Table 10                                                         ______________________________________                                                       Shunshine carbon apparatus                                       Test compound (Hunter colori and gloss meter)                                  No.           color difference Δ E                                       ______________________________________                                          3            3.7                                                              11            3.2                                                              13            2.4                                                              20            2.5                                                              33            2.8                                                              52            3.6                                                              58            2.8                                                              76            2.9                                                              104           3.7                                                              None          4.5                                                              ______________________________________                                    

EXAMPLE 27

Into 100 parts of polyvinylidene chloride resin ["Kurecharon DOA", trade name, available from Kureha Chemical Industry Co., Japan] was incorporated 0.1 part of each of the test compounds of this invention indicated below. The resulting mixture was dissolved in an appropriate amount of tetrahydrofuran and the solvent was distilled off to form a sheet having a thickness of about 0.5 mm.

The sheet thus formed was subjected to the exposure to ultraviolet ray irradiation in the fade meter at 45° C. for 5 hours and the coloration degree thereof was determined and compared.

The results are given in the following Table 11.

                  Table 11                                                         ______________________________________                                         Test compound Coloration degree in fade meter                                  No.           after 5 hours                                                    ______________________________________                                          1            pale yellow                                                      12            pale yellow                                                      13            pale yellow                                                      20            pale yellow                                                      58            pale yellow                                                      70            yellow                                                           77            yellow                                                           None          brown                                                            ______________________________________                                    

EXAMPLE 28

Into 100 parts of polyethylene ["2100 GP", trade name, available from Mitsui Toatsu Chemicals Inc., Japan] were incorporated 0.25 part of each of the test compounds of this invention indicated below and 0.5 part of BHT (2,6-di-tert.butyl-hydroxy toluene). The resulting mixture was heated and melted and then molded into a plate having a thickness of 3 mm.

The plate thus formed was left in a dark place at 60° C. for 3 weeks and then the coloration degree thereof was determined.

The results are given in the following Table 12.

                  Table 12                                                         ______________________________________                                         Test compound No. After 3 weeks at                                             (+ BHT)           60° C.                                                ______________________________________                                         11                Colorless                                                    12                "                                                            13                "                                                            33                "                                                            58                "                                                            59                "                                                            69                "                                                            76                "                                                            109               "                                                            111               "                                                            ______________________________________                                    

EXAMPLE 29

The substantially same procedure as shown in the above Example 28 was repeated except that polypropylene ["JHH-G", trade name, available from Mitsui Toatsu Chemicals Inc., Japan, employed after twice recrystallization from monochlorobenzene] was utilized instead of the polyethylene.

The results are given in the following Table 13.

                  Table 13                                                         ______________________________________                                         Test compound No. After 4 weeks                                                (+ BHT)           at 60° C.                                             ______________________________________                                         11                Colorless                                                    12                "                                                            13                "                                                            33                "                                                            58                "                                                            59                "                                                            69                "                                                            76                "                                                            109               "                                                            111               "                                                            ______________________________________                                    

It can be apparent from the above-given results that the piperidine derivatives (I) of this invention exert a high degree of stabilizing effect against thermal-and photo-deterioration of various synthetic polymers. 

What is claimed is:
 1. A compound having the formula ##STR62## wherein n is 1;X represents an oxygen atom or a sulfur atom; Y represents an oxygen atom, a sulfur atom or a group of the formula ##STR63## in which R" is hydrogen, methyl, allyl, 2-propynyl, 2-hydroxyethyl, 2-methoxyethyl or benzyl; Z represents an oxygen atom or a group of the formula ##STR64## in which R'" is hydrogen, an alkyl group having from 1 to 4 carbon atoms, allyl, 2-propynyl, 2-hydroxyethyl, ethoxymethyl, 2-vinyloxyethyl, 2-phenoxyethyl, 2-acetoxyethyl, 2-benzoyloxyethyl or benzyl; R represents an alkyl group having from 1 to 20 carbon atoms, a hydroxyalkyl group having from 2 to 3 carbon atoms, an alkenyl group having from 3 to 4 carbon atoms, the 2-propynyl group, a cyanoalkyl group having from 2 to 3 carbon atoms, an alkoxyalkyl group having from 2 to 5 carbon atoms, the 2-hydroxy-2-phenylethyl group, a 2-acyloxy-2-phenylethyl group having from 10 to 20 carbon atoms, the vinyloxyethyl group, the phenoxyethyl group, the methylthioethyl group, the 2,3-epoxypropyl group, an acyloxyalkyl group having from 4 to 14 carbon atoms, an alkoxycarbonylalkyl group having from 3 to 15 carbon atoms, an aryloxycarbonylalkyl group having from 8 to 12 carbon atoms, an aralkyl group having from 7 to 8 carbon atoms, a 2,3-epoxypropyloxycarbonylalkyl group having from 5 to 6 carbon atoms, an aryl group having 6 to 10 carbon atoms, the cyclohexyl group, an alkoxycarbonyl group having from 2 to 9 carbon atoms, an aralkoxycarbonyl group having from 8 to 9 carbon atoms, a dialkoxyphosphine group having from 2 to 16 carbon atoms, the diphenoxyphosphine group, a group of the formula ##STR65## in which R"" is an alkyl group having from 1 to 8 carbon atoms or a phenyl group; and R' represents an alkyl group having from 1 to 20 carbon atoms, a hydroxyalkyl group having from 2 to 3 carbon atoms, an alkenyl group having from 3 to 4 carbon atoms, the 2-propynyl group, a cyanoalkyl group having from 2 to 3 carbon atoms, an alkoxyalkyl group having from 2 to 5 carbon atoms, vinyloxyethyl, phenoxyethyl, methylthioethyl, the 2,3-epoxypropyl group, an acyloxyalkyl group having from 3 to 14 carbon atoms, an alkoxycarbonylalkyl group having from 3 to 15 carbon atoms, an aralkyl group having from 7 to 8 carbon atoms, the 2-hydroxy-2-phenylethyl group, a 2-acyloxy-2-phenylethyl group having from 10 to 20 carbon atoms, the acetyl group, an α,β-unsaturated aliphatic acyl group having from 3 to 9 carbon atoms, an alkoxycarbonyl group having from 2 to 9 carbon atoms, an aralkoxycarbonyl group having from 8 to 9 carbon atoms, the amino group, an acyl amino group having from 2 to 12 carbon atoms, an alkylamino group having from 1 to 2 carbon atoms, or the nitroso group, wherein all acyl groups are carboxyl derived acyl groups.
 2. A compound having the formula ##STR66## wherein R' represents octanoyloxyethyl, allyl, benzyl, ethoxycarbonylmethyl, hydroxyalkyl having from 2 to 3 carbon atoms, alkenyl having from 3 to 4 carbon atoms, 2-propynyl, cyanoalkyl having from 2 to 3 carbon atoms, alkoxyalkyl having from 2 to 5 carbon atoms, vinyloxyethyl, phenoxyethyl, methylthioethyl, 2,3-epoxypropyl, alkanoyloxyalkyl having from 3 to 14 carbon atoms, alkoxycarbonylalkyl having from 3 to 15 carbon atoms, aralkyl having from 7 to 8 carbon atoms, 2-hydroxy-2-phenylethyl, alkoxycarbonyl having from 2 to 9 carbon atoms, aralkoxycarbonyl having from 8 to 9 carbon atoms, amino group, alkylamino group having from 1 to 2 carbon atoms, nitroso group;X represents oxygen or sulfur; Y represents oxygen, sulfur or a group of the formula ═N--R" in which R" is hydrogen or methyl; Z represents oxygen or a group of the formula ═N--R'" in which R'" is hydrogen or alkyl having from 1 to 4 carbon atoms; n is 1; and R represents an alkyl group having from 1 to 20 carbon atoms, a hydroxyalkyl group having from 2 to 3 carbon atoms, an alkenyl group having from 3 to 4 carbon atoms, the 2-propynyl group, a cyanoalkyl group having from 2 to 3 carbon atoms, an alkoxyalkyl group having from 2 to 5 carbon atoms, the 2-hydroxy-2-phenylethyl group, a 2-acyloxy-2-phenylethyl group having from 10 to 20 carbon atoms, the vinyloxyethyl group, the phenoxyethyl group, the methylthioethyl group, the 2,3-epoxypropyl group, an acyloxyalkyl group having from 4 to 14 carbon atoms, an alkoxycarbonylalkyl group having from 3 to 15 carbon atoms, an aryloxycarbonylalkyl group having from 8 to 12 carbon atoms, an aralkyl group having from 7 to 8 carbon atoms, a 2,3-epoxypropyloxycarbonylalkyl group having from 5 to 6 carbon atoms, an aryl group having 6 to 10 carbon atoms, the cyclohexyl group, an alkoxycarbonyl group having from 2 to 9 carbon atoms, an aralkoxycarbonyl group having from 8 to 9 carbon atoms, a dialkoxyphosphine group having from 2 to 16 carbon atoms, the diphenoxyphosphine group, a group of the formula ##STR67## in which R"" is an alkyl group having from 1 to 8 carbon atoms or a phenyl group; and R' represents an alkyl group having from 1 to 20 carbon atoms, a hydroxyalkyl group having from 2 to 3 carbon atoms, an alkenyl group having from 3 to 4 carbon atoms, the 2-propynyl group, a cyanoalkyl group having from 2 to 3 carbon atoms, an alkoxyalkyl group having from 2 to 5 carbon atoms, vinyloxyethyl, phenoxyethyl, methylthioethyl, the 2,3-epoxypropyl group, an acyloxyalkyl group having from 3 to 14 carbon atoms, an alkoxycarbonylalkyl group having from 3 to 15 carbon atoms, an aralkyl group having from 7 to 8 carbon atoms, the 2-hydroxy-2-phenylethyl group, a 2-acyloxy-2-phenylethyl group having from 10 to 20 carbon atoms, the acetyl group, an α,β-unsaturated aliphatic acyl group having from 3 to 9 carbon atoms, an alkoxycarbonyl group having from 2 to 9 carbon atoms, an aralkoxycarbonyl group having from 8 to 9 carbon atoms, the amino group, an acyl amino group having from 2 to 12 carbon atoms, an alkylamino group having from 1 to 2 carbon atoms, or the nitroso group, wherein all acyl groups are carboxyl derived acyl groups.
 3. The compound of claim 1 whereinX represents oxygen atom, Y represents oxygen atom, Z represents oxygen atom or a group of the formula >N--R'" in which R'" is hydrogen, an alkyl group having from 1 to 4 carbon atoms, allyl or benzyl, R' represents an alkyl group having from 1 to 8 carbon atoms, a hydroxyalkyl group having from 2 to 3 carbon atoms, an allyl group, the 2,3-epoxypropyl group, an alkanoyloxyalkyl group having from 4 to 10 carbon atoms, the benzyl group, the 2-hydroxy-2-phenylethyl group, the acetyl group, an α,β-unsaturated aliphatic alkanoyl group having from 3 to 4 carbon atoms, R represents alkyl having from 1 to 8 carbon atoms, 2,3-epoxypropyloxycarbonylalkyl having from 5 to 6 carbon atoms, aryloxycarbonylalkyl having from 8 to 12 carbon atoms, aryl having from 6 to 10 carbon atoms, aromatic alkanoyloxyalkyl having from 9 to 13 carbon atoms, saturated aliphatic alkanoyloxyalkyl having from 4 to 10 carbon atoms, unsaturated aliphatic alkanoyloxyalkyl having from 5 to 6 carbon atoms, dialkoxyphosphine having 2 to 16 carbon atoms, diphenoxyphosphine of the formula ##STR68## wherein R"" is alkyl having from 1 to 8 carbon atoms or phenyl.
 4. The compound of claim 1 whereinR' is an alkyl group having from 1 to 8 carbon atoms, a hydroxyalkyl group having 2 or 3 carbon atoms, or 2,3-epoxypropyl group, R is 2,3-epoxypropyl group or a hydroxyalkyl group having 2 or 3 carbon atoms, X is oxygen atom, Y is oxygen atom, Z is a group >N--R'", and R'" is hydrogen atom.
 5. The compound of claim 1 whereinX is oxygen; Y is >N--R" wherein R" is methyl, 2-hydroxyethyl, 2-methoxyethyl, benzyl, allyl or 2-propynyl, and Z is >N--R'" wherein R'" is 2-propynyl, 2-hydroxyethyl, ethoxymethyl, 2-vinyloxyethyl, 2-phenoxyethyl, 2-acetoxyethyl, 2-benzoyloxyethyl or benzyl.
 6. The compound of claim 1 whereinR' represents an alkyl group having from 1 to 8 carbon atoms, a hydroxyalkyl group having from 2 to 3 carbon atoms, an allyl group, the 2,3-epoxypropyl group, an alkanoyloxyalkyl group having from 4 to 10 carbon atoms, the benzyl group, the 2-hydroxy-2-phenylethyl group.
 7. The compound of claim 1 wherein R' is methyl.
 8. The compound of claim 1 wherein R' is octanoyloxyethyl.
 9. The compound of claim 1 wherein R' is allyl.
 10. The compound of claim 1 wherein R' is benzyl.
 11. The compound of claim 1 wherein R' is ethoxycarbonylmethyl.
 12. The compound of claim 1 wherein R' is an alkyl group having from 1 to 20 carbon atoms.
 13. The compound of claim 1 wherein R' is a hydroxyalkyl group having from 2 to 3 carbon atoms.
 14. The compound of claim 1 wherein R' is an alkenyl group having from 3 to 4 carbon atoms.
 15. The compound of claim 1 wherein R' is the 2-propynyl group.
 16. The compound of claim 1 wherein R' is a cyanoalkyl group having from 2 to 3 carbon atoms.
 17. The compound of claim 1 wherein R' is an alkoxyalkyl group having from 2 to 5 carbon atoms.
 18. The compound of claim 1 wherein R' is vinyloxyethyl.
 19. The compound of claim 1 wherein R' is phenoxyethyl.
 20. The compound of claim 1 wherein R' is methylthioethyl.
 21. The compound of claim 1 wherein R' is the 2,3-epoxypropyl group.
 22. The compound of claim 1 wherein R' is an alkanoyloxyalkyl group having from 3 to 14 carbon atoms.
 23. The compound of claim 1 wherein R' is an alkoxycarbonylalkyl group having from 3 to 15 carbon atoms.
 24. The compound of claim 1 wherein R' is an aralkyl group having from 7 to 8 carbon atoms.
 25. The compound of claim 1 wherein R' is the 2-hydroxy-2-phenylethyl group.
 26. The compound of claim 1 wherein R' is an alkoxycarbonyl group having from 2 to 9 carbon atoms.
 27. The compound of claim 1 wherein R' is an aralkoxycarbonyl group having from 8 to 9 carbon atoms.
 28. The compound of claim 1 wherein R' is the amino group.
 29. The compound of claim 1 wherein R' is an alkylamino group having from 1 to 2 carbon atoms.
 30. The compound of claim 1 wherein R' is the nitroso group. 